Develop Bugs

WiFi Calling and VoLTE and AT&T

It's my understanding that these features (advanced calling, like WiFi calling and VoLTE) Doo not work on unbranded devices like Pixel and others. This was the case with my unbranded SM935F or Galaxy S7 Edge until we got some files, an appropriate CSC, and also had AT&T switch our account to an IMEI of an AT&T branded device that had working WiFi Calling (others have apparently just called AT&T and had them provision WiFi Calling)
Note: for me, I have a business account so I could just go into my business portal and put in an IMEI that I got from an S7 Edge model in an AT&T store
I am attaching the files that we needed to add to our system to get WiFi calling to work on AT&T. I think I remember all I had to do was to add them and make sure permissions were correct
Here is an IMEI that I saw on another post that may work ..... But I do know that the AT&T system needs to recognize your phone IMEI as an att branded device that has working WiFi calling. So if you aren't business customers it will require a call to customer support.
Possible working IMEI:
Mod edit: Removed
Any Pixel AT&T users that could try this and report back would be greatly appreciated!
Btw, I'm not completely sure which files are needed in the Pixel as compared to the S7 Edge .... I would have a backup available
Here's link
https://drive.google.com/file/d/0B4qgtyu0rDEbU3dGNnhLZ0FXTWM/view?usp=drivesdk
File too late to upload here

You don't need any of that for WiFi calling or VoLTE. That all works fine on custom roms

spaceman860 said:
You don't need any of that for WiFi calling or VoLTE. That all works fine on custom roms
Click to expand...
Click to collapse
I obviously could be wrong ...... But I'm 99% sure that what you are saying is not true for AT&T and maybe even other USA carriers!
I KNOW that I'm right for S7 phones and ROMs .... And the problem is so pervasive that they have even been able to get unbranded S8's to obtain WiFi Calling on AT&T or other USA carriers (even though WiFi calling works great on branded S8 phones)
AT&T users a different mechanism to provision WiFi calling than other carriers

jcrompton said:
I obviously could be wrong ...... But I'm 99% sure that what you are saying is not true for AT&T and maybe even other USA carriers!
I KNOW that I'm right for S7 phones and ROMs .... And the problem is so pervasive that they have even been able to get unbranded S8's to obtain WiFi Calling on AT&T or other USA carriers (even though WiFi calling works great on branded S8 phones)
AT&T users a different mechanism to provision WiFi calling than other carriers
Click to expand...
Click to collapse
You are correct that AT&T does not allow unbranded phones to use those features. It's all BS too. I have great LTE coverage but many times I will go to make a call and have crap service because they have canabalized a lot of the hsdpa towers for LTE. Then the switch back to LTE can take forever. And I don't care what they or anyone says AT&T's hspa+ is no where near as fast

None of this works, as AT&T blocks access to VoLTE on Pixel phones. Denies me the use of Numbersync for my tablet and android wear 2.0 watches. AT&T service techs keep promising to fix it and try to force it to work, but still blocked. It is simply a situation for Google to get the Pixel certified for the AT&T network, which is problematic, as AT&T uses a non-standard protocol for HD Voice that is unique to their network. So, as best I can tell, AT&T has to release the source code, for a price, I presume, to Google to add to the phones and then pay for the certification process with the FCC. Seems a stand-off as long as Google has an "exclusive" arrangement with Verizon. So for me, I'm pissed not to have numbersync for my devices, but unwilling to give up all the advantages of the Pixel phone.

That's why I switched to T-Mobile.

So there is no way to get VoLTE on the Pixel XL with AT&T then?
Sent from my Pixel XL using Tapatalk

chipstien said:
So there is no way to get VoLTE on the Pixel XL with AT&T then?
Sent from my Pixel XL using Tapatalk
Click to expand...
Click to collapse
Not currently

If AT&T carries the upcoming Pixel 2, is it possible Numbersync would start working on Pixel 1 devices?

jkimrey said:
If AT&T carries the upcoming Pixel 2, is it possible Numbersync would start working on Pixel 1 devices?
Click to expand...
Click to collapse
I doubt it. They only support advanced features on devices sold by them so it's not as if older Pixels will suddenly be grandfathered in just because they start carrying newer ones.

This annoys me to no end... If I buy a phone from att, do they have to give me an unlock code when the phone is paid off? I really need WiFi calling for a trip I make multiple times a year
Sent from my Pixel XL using Tapatalk

murso74 said:
This annoys me to no end... If I buy a phone from att, do they have to give me an unlock code when the phone is paid off? I really need WiFi calling for a trip I make multiple times a year
Sent from my Pixel XL using Tapatalk
Click to expand...
Click to collapse
I was able to get the code the same day or next for the att Note 8 that was bought from Samsung. The device is paid off.

muzzy996 said:
I doubt it. They only support advanced features on devices sold by them so it's not as if older Pixels will suddenly be grandfathered in just because they start carrying newer ones.
Click to expand...
Click to collapse
Yeah according to a rep I spoke with, the pixel 2 will support Numbersync even though att isn't selling them. There are, however, no plans to change the restriction on the original pixels.

I'm in the same boat but I'm genuinely curious - if I don't need wifi calling - is it really a big deal not having VoLTE? I'm taking in terms of better signal or faster LTE internet speed. Or does VoLTE is just having clearer phone calls? I guess what I'm asking is what other benefits are we losing (on a technical standpoint)

keplenk said:
I'm in the same boat but I'm genuinely curious - if I don't need wifi calling - is it really a big deal not having VoLTE? I'm taking in terms of better signal or faster LTE internet speed. Or does VoLTE is just having clearer phone calls? I guess what I'm asking is what other benefits are we losing (on a technical standpoint)
Click to expand...
Click to collapse
Late response but as far as AT&T goes besides VoLTE what I experienced on my Pixel XL was random issues with group text (MMS) reception from certain individuals from other carriers.
In particular it seemed as though if senders of MMS texts to a group chat that I was participating in sent a text from a carrier like T-Mobile and they were using Samsung devices with VoLTE and enhanced LTE stuff enabled on their end I'd not receive the text. I would instead receive texts from others in the conversation. I could freely text any of the same individuals in a separate standard SMS conversation just fine, and they could send me an MMS text like a photo, but as soon as we were in group MMS I'd lose the ability to receive their texts and no amount of APN changes or combinations of texting apps would fix it.
I can't tell you how many times over the course of the first 5 months of owning my Pixel XL with an AT&T SIM in it I missed out on half the conversation in group MMS. Doing nothing to my phone other than porting number to T-Mobile and putting in my new T-Mobile SIM all of my group MMS issues went away (replaced with ****ty signal LOL but that's a different story). I'm now on Verizon with my XL and am a happy camper, albeit poorer having wasted money jumping around.

HD Calling and Advanced LTE on AT&T

I noticed that when I make a call, the phone drops from LTE to HSPA or whatever their 3G band is called. I have an LTE SIM in there that had HD calling working on my Essential, Pixel2 XL, iPhone 8+, OP3, etc...
I was getting HD calling on all of those devices, and I did call AT&T support and had them add my IMEI to the line, so it should be working. Is there something that I have to do to enable it on the phone?
My concern is that if I am tethering while on a conf call, I won't get LTE and that's a problem.
Thoughts?

U had it on ur op3, I thought att did not allow volte on non att phones, I was never able to get it on my op3

I thought that I did, and I did on my Essential. Damn it, this sucks... Might have to go back to the Essential. Not having voice and data at the same time in 2018 blows... I am within the return window, although because of the credit card breach, the card they would need to refund to, has been canceled... What a cluster...

Yeah, ran through all sorts of hoops with several customer service reps. They say that VoLTE is enabled and provisioned properly to this SIM and IMEI, but I can't get it to work and it doesn't even show up as an option to enable it in any of the phone's menus... So either AT&T won't allow this BYOD device to have simlutanous voice and data on LTE, or maybe something in the beta isn't giving me the option.
Is anyone running the stock non beta OOS and getting VoLTE to work on AT&T?

I also gave them an IMEI from one of my other phones, an AT&T branded Note 5 that I own, and told them to put that one in and see if it worked, because that would tell me whether it is the phone itself not able to do it, or a provisioning thing on AT&T's end... That didn't work either...
I then went back to my Essential and had them enter that IMEI and it didn't work either...
I guess if I want wifi calling and voice and data at the same time, I have to pay a ton of money for an AT&T phone... Kinda bummed...

I talked to their support and put the SIM back in my Essential, and it fired right up and has VoLTE and doesn't drop to H+ when I make a call. Same SIM, I didn't even call to give them the IMEI. So something isn't supported on the OP5T.
Which sucks, because between the two phones, I really prefer the 5T. Oh well, I guess it wasn't meant to be... That's the downside of buying unlocked phones, you may miss out on some of the key features that you want on the carrier side...

Which ROM are you on?
Did you turn on VoLTE in settings if you are in stock OOS? If not you can try a custom ROM like Liquid Remix that have VoLTE working

Stock rom. If I have to install a custom rom to get the phone to work, not worth it. I will just return it and get my money back

AT&T only enables VoLTE and LTE+ on provisioned devices and supported, usually BYOD especially for a non-listed device does NOT apply. I was on AT&T when I got my 5T, tried my sim from iPhone 6S and a brand new sim I got at the store that I was assured would have VoLTE capability, but nothing. Not even wifi calling would work on my 5T. No options in Settings either to toggle it. They want you to buy the device from them is why they do this on unlocked phones.
I switched to T-Mobile and I had VoLTE, LTE+, and VoWiFi all on first boot with T-Mobile sim, with all of them listed in Settings on the same device with same software version as I was when on AT&T's network.
It's simply just a case of AT&T not supporting the device. Typically only carrier-sold phones for AT&T will have those capabilities, if you look it up you'll see many people say the same. Personally I'm glad I switched to T-Mobile because they don't lock down all of those features to try to get me to buy a phone from the carrier like AT&T did/does. I'd never go back to them at this point. Sorry but if staying on AT&T is the only option for you I'd look into how you could go about returning the phone to OnePlus and getting something AT&T-approved.

SquireSCA said:
Stock rom. If I have to install a custom rom to get the phone to work, not worth it. I will just return it and get my money back
Click to expand...
Click to collapse
EnveeAtlas said:
AT&T only enables VoLTE and LTE+ on provisioned devices and supported, usually BYOD especially for a non-listed device does NOT apply. I was on AT&T when I got my 5T, tried my sim from iPhone 6S and a brand new sim I got at the store that I was assured would have VoLTE capability, but nothing. Not even wifi calling would work on my 5T. No options in Settings either to toggle it. They want you to buy the device from them is why they do this on unlocked phones.
I switched to T-Mobile and I had VoLTE, LTE+, and VoWiFi all on first boot with T-Mobile sim, with all of them listed in Settings on the same device with same software version as I was when on AT&T's network.
It's simply just a case of AT&T not supporting the device. Typically only carrier-sold phones for AT&T will have those capabilities, if you look it up you'll see many people say the same. Personally I'm glad I switched to T-Mobile because they don't lock down all of those features to try to get me to buy a phone from the carrier like AT&T did/does. I'd never go back to them at this point. Sorry but if staying on AT&T is the only option for you I'd look into how you could go about returning the phone to OnePlus and getting something AT&T-approved.
Click to expand...
Click to collapse
I have an ATT sim from my company originally meant for an iPhone. VoLTE did not work on a google pixel cause the plan was not compatible. And since it is not my plan I can't make changes. I ordered the Oneplus to see if I could get it to work. And on a Stock ROM it will not work without Root and the Magisk Module to enable VoLTE. It will work on Custom ROMS such as Omni and Phoenix, both of with work for me with no issues.

In the end I returned the OP5T for a refund, and am back to using my Essential. While that is a non-AT&T phone that I bought right from Essential, it does support VoLTE out of the box, no issues. I don't get Wifi Calling, but I get HD Calling, works with my tethering plan, etc... Not sure why the Essential works but the OP5T doesn't, and it sucks because I liked the OP5T more... but it is what it is...

[IMG=http://ibb.co/cACzS7[/IMG]
i got it working on the 5T

IRatchett said:
Click to expand...
Click to collapse
It works on ATT, but the issue is that it doesn't do HD Calling, Wifi Calling, etc...
Make a phone call and while you are on the phone, you lose LTE and it drops to HSPA(3G)...
It's not a phone limitation, it's that AT&T won't allow it to have those features on their network. That is the ONLY reason I sent the phone back. Hopefully they address it with the OP6 and get in "approved" for AT&T and I can sell my iPhone 8+ and come back to Android...

SquireSCA said:
It works on ATT, but the issue is that it doesn't do HD Calling, Wifi Calling, etc...
Make a phone call and while you are on the phone, you lose LTE and it drops to HSPA(3G)...
It's not a phone limitation, it's that AT&T won't allow it to have those features on their network. That is the ONLY reason I sent the phone back. Hopefully they address it with the OP6 and get in "approved" for AT&T and I can sell my iPhone 8+ and come back to Android...
Click to expand...
Click to collapse
Sorry, but this will never happen in the foreseeable future.
AT&T purposely does this to all BYOD, so the OP6 is not going to change anything. They only offer these options for phones you purchase directly through them online or in an AT&T store.

EnveeAtlas said:
Sorry, but this will never happen in the foreseeable future.
AT&T purposely does this to all BYOD, so the OP6 is not going to change anything. They only offer these options for phones you purchase directly through them online or in an AT&T store.
Click to expand...
Click to collapse
Not entirely true. The Pixels you buy straight from Google, work. The Essential that I had, worked fine. There are phones that work just fine that you don't have to purchase through AT&T.

SquireSCA said:
Not entirely true. The Pixels you buy straight from Google, work. The Essential that I had, worked fine. There are phones that work just fine that you don't have to purchase through AT&T.
Click to expand...
Click to collapse
No I got it working, i was trying to show a screenshot

IRatchett said:
No I got it working, i was trying to show a screenshot
Click to expand...
Click to collapse
How did you get it working? I didn't want to root it and install a custom ROM, which I believe was the only way to get it working.
I tried using an IMEI from one of my other phones that I know worked, etc... Nothing worked.

You guys know that even if you show the switches and turn them on, that the LTE data doesn't work right? It's just showing the options and you can turn them on. I even have my OP5t added to my account as an ATT LG G6 and it doesn't work. Unless there is some agreement, like with the Essential Phone or Google's only official phone, you're out of luck.

xgerryx said:
You guys know that even if you show the switches and turn them on, that the LTE data doesn't work right? It's just showing the options and you can turn them on. I even have my OP5t added to my account as an ATT LG G6 and it doesn't work. Unless there is some agreement, like with the Essential Phone or Google's only official phone, you're out of luck.
Click to expand...
Click to collapse
Exactly, that's what I was getting at. I talked to ATT several times, tried different IMEI's and nothing worked. Regardless of what the options in the menu claim, it doesn't work. If you are just using your phone it will say LTE. But when you make a call, as soon as it connects, it switches to 3G or HSPA+... It won't do phone calls and LTE data at the same time.
If it did, I would have kept the phone. But that's a pretty big feature to have to live without for me. That and HD calling, Wifi Calling, etc...
I wish that OnePlus would do whatever they need to do to get the phone "certified" for ATT, but I don't see that happening...

SquireSCA said:
Exactly, that's what I was getting at. I talked to ATT several times, tried different IMEI's and nothing worked. Regardless of what the options in the menu claim, it doesn't work. If you are just using your phone it will say LTE. But when you make a call, as soon as it connects, it switches to 3G or HSPA+... It won't do phone calls and LTE data at the same time.
If it did, I would have kept the phone. But that's a pretty big feature to have to live without for me. That and HD calling, Wifi Calling, etc...
I wish that OnePlus would do whatever they need to do to get the phone "certified" for ATT, but I don't see that happening...
Click to expand...
Click to collapse
Yea, it's a pretty crappy situation. I came from a Moto x Pure to the OP5 and then to the OP5t and it was a big disappointment when I was stuck without LTE on calls. I had the Moto x on Verizon though. I really don't get why they restrict BYOD phones at all considering that if people use MORE data, they are likely to bump up their plans to the next tier. I kinda don't get the rationale. Anyway, it is what it is. I love my OP5t and hope to keep this phone for a while, unlike many past phones. But I live in a city, so rarely have issues here.

SM-G960F/DS on Verizon in the US

Hi all,
I have in my hands an unopened G960F/DS. I was considering this phone to replace an old model, it's long due. I thought I did my homework and was able to determine this phone worked on Verizon in the US, but a serious note on the box and further research suggests I may have been wrong. Although it would be nice to have new hardware, I am replacing the old one almost entirely out of a desire to flash a custom ROM on it. I was under the impression the lack of CDMA support wasn't a big issue given that Verizon (and everyone else) is phasing out CDMA and the phone still had LTE. Thus my choice of the F/DS. I am informed that opening the box and returning the phone will incur a charge, while keeping the box sealed and returning it will not. I am trying to decide to continue forward and test on Verizon's network here in the US or just return the thing, the choice lies in compatibility with this network. So now I get to play a guessing game.
I find myself in 4G LTE areas most of the time. I want to use data and make voice calls.
This 2-post thread suggests not much can be done:
https://forum.xda-developers.com/galaxy-s9/help/sm-g960f-verizon-network-t3856443
This guy demonstrating slower speeds, which I'm not too concerned about, but also HSPA+ in an area he usually gets LTE. In the video description he says after applying a software update it works 'fine':
https://www.youtube.com/watch?v=pkNXCK2iVO8
This site lists some band compatibility but doesn't say anything about not being able to use it with Verizon:
https://apn.gishan.net/en/apn/verizon/samsung-galaxy-s9
This site also lists band compatibility but warns about Verizon's strict device policy:
https://www.frequencycheck.com/carr...e-samsung-star/verizon-wireless-united-states
Is there any hope to use an unlocked S9 on Verizon in the US? I see this going one of several ways: 1) Everyone works out and I can make calls and use data and there are no issues and rainbows and unicorns 2) Data in certain places, no voice because something something "VoLTE" 3) Absolutely no data/voice whatsoever 4) I switch carriers I return this piece of junk and buy a phone that works. (might coincide with 2/3)
If I end up with (4), how can I avoid this issue in the future? I spent some considerable time deciding on this model, which has the features I want and an unlockable bootloader. Will the S10 have this issue? What about the Note 9? I apologize for the noobposting, and if I missed a thread that answered this question. Thanks for any help you can provide, I sincerely appreciate it.
Edit: This thread asks a similar question but isn't specific and neither are the answers:
https://us.community.samsung.com/t5/Galaxy-S9/Unlocked-galaxy-S9-on-Verizon/td-p/277493

I have been using a G965f/ds on Verizon Wireless.
VoLTE, vowifi, text, and data work after rooting.
Having done a speed test with a U device and on the g965f/ds, the speed I can receive seems equal.
I haven't had issues with making LTE calls in my area.

CynicalHeight00 said:
I have been using a G965f/ds on Verizon Wireless.
VoLTE, vowifi, text, and data work after rooting.
Having done a speed test with a U device and on the g965f/ds, the speed I can receive seems equal.
I haven't had issues with making LTE calls in my area.
Click to expand...
Click to collapse
Thanks for the feedback. Are you based in the US? How did you activate the phone? I found instructions on LTE activation here:
www . verizonwireless . com/businessportals/support/how_to_use/activate_4g_lte.html
And an IMEI checker, which fails when I enter what I find on the box my phone is in:
www . verizonwireless . com/od/prepaid/bring-your-own-device/#/checkDevice
Edit: It also looks like they have a second page that checks IMEI (this also fails for me). Can you tell me what either of these pages say when you enter your IMEI?
www . verizonwireless . com/onedp/byod#/

I reside in the US.
The imei of my g965d/fs failed when inputted in to their system;however, the SIM is all that's needed for Verizon wireless to work on it. Initially, though, you might need to insert the SIM card into another imei Verizon wireless compatible device only to allow the system to have that imei in the system for your number. Since, you already have vzw, I'm assuming you already are activated on it with a device, so moving sims is the next step.

Thanks for your input. Anyone else have experience with this device on Verizon's network?

I could have written this exact post.
jmtroth said:
Thanks for your input. Anyone else have experience with this device on Verizon's network?
Click to expand...
Click to collapse
I am trying to do the same thing with the same model Note 9, SM-N960F/DS. I was told by Verizon Level 2 tech rep that simply installing an activated SIM would make the phone work, obviously 4gLTE only since there are no CDMA bands. He checked the 4 bands Verizon uses for their 4gLTE and the F/DS model has all 4 of them.
I am in the same boat as you though. IF I try it and it doesn't work I have to return and lose $125 or switch to GSM network (AT&T or TMO) I am also trying to decide whether to take the gamble. This Level 2 Tech guy didn't mention anything about having to root the phone.
I would also like to know about the advisability of attempting this. I thought I read somewhere that this phone won't have any warranty in US anyway but I am not 100% sure about that. Sellers seem to want to gloss over that issue.

I'm very very interested in this

to put this to bed, you cant use any F galaxy phone on verizon and get full usage. vzw is a CDMA based carrier whereby voice is transmitted primarily via CDMA and data over GSM (which includes voLTE, obviously). The F model do not have CDMA radios in them. You CAN get data to work and therefore voLTE as long as you can flash the vzw CSC to get the phone to install the voLTE app. Long story short, dont try it. Its a fruitless endeavor. I mean, do what you want, i guess, but dont expect for the F to work well, or at all on vzw. There is nothing anybody on xda or anywhere can do to alleviate that.

I had straight talk using Verizon towers on note 8, my note 8 broke, I missed flashing custom ROMs, I bought a note 9 n960f, read online it would work too. I inserted sim. Did not get data or calls. Flashed custom ROMs found a lineage is rom that worked with data for like 2 min then quit. I kept Singapore rom csc stock radios I guess from Singapore, guy on here said he flashed Singapore stock Odin flash and ended up making his work but didn't work with my straight talk Verizon sim. My buddy came over and he uses visible network on Verizon towers we popped in his sim and it worked flawlessly on stock Singapore csc/flashed custom rom from xda. I switched, it's cheaper, it works and first month was 5$ no fee to transfer my number over. Visible is great, join a group and it's 25$ a month.

Supplementary services not working on N975F/DS with AT&T

Hey so I am having an issue where the Supplementary Services on my N975F/DS are not working with AT&T but seems to work fine with a T-Mobile SIM. Whenever I try to open Supplementary Services with my AT&T SIM inserted it gives me an error "Failed to read data. Something went wrong. Check your SIM card or network connection, then try again."
I have already tried the following:
Replaced my AT&T SIM card twice
Reset Network settings
Spoke with multiple AT&T representatives who allegedly changed some stuff on the "backend" to fix it but in reality it did nothing.
I am on Android 10 running Dr.Ketan rom Q07. Only have 1 SIM card inserted, the other slot has my MicroSD card.
So any ideas on what I could try to get this fixed?
Thanks!

This isn't the answer you want but change carriers. I have the same device and AT&T didn't play nicely with it. Slow data and no wifi calling. I switched to TMobile (and mint for a cheap second line) and it works perfectly.

sansnil said:
This isn't the answer you want but change carriers. I have the same device and AT&T didn't play nicely with it. Slow data and no wifi calling. I switched to TMobile (and mint for a cheap second line) and it works perfectly.
Click to expand...
Click to collapse
I've thought about it for a while now, just didn't want to pull the trigger since I have everything with AT&T (been with them since they were CIngular/Pac-Bell). How's the coverage and signal strength compared to AT&T? Any downsides/issues after switching?

eL_MeXiCaNo said:
I've thought about it for a while now, just didn't want to pull the trigger since I have everything with AT&T (been with them since they were CIngular/Pac-Bell). How's the coverage and signal strength compared to AT&T? Any downsides/issues after switching?
Click to expand...
Click to collapse
That's a good question. I was an AT&T customer for 10+ years before bailing and I had some concerns about T-Mobile's coverage and network but I was pleasantly surprised their coverage was right there with AT&T and the Verizon phone I use for work. Coverage probably varies for everyone based on where they live but I've been using T-Mobile for almost a year and no regrets. It's a nice perk getting Netflix for $2 a month and they support RCS for text and Wifi calling. Btw, I don't work for T-Mobile or even own stock, just sharing my experience with them.

sansnil said:
This isn't the answer you want but change carriers. I have the same device and AT&T didn't play nicely with it. Slow data and no wifi calling. I switched to TMobile (and mint for a cheap second line) and it works perfectly.
Click to expand...
Click to collapse
sansnil said:
That's a good question. I was an AT&T customer for 10+ years before bailing and I had some concerns about T-Mobile's coverage and network but I was pleasantly surprised their coverage was right there with AT&T and the Verizon phone I use for work. Coverage probably varies for everyone based on where they live but I've been using T-Mobile for almost a year and no regrets. It's a nice perk getting Netflix for $2 a month and they support RCS for text and Wifi calling. Btw, I don't work for T-Mobile or even own stock, just sharing my experience with them.
Click to expand...
Click to collapse
You don't own stock? Well too bad, I'm sure my extra $50 a month would of made you a billionaire :laugh: xD
But yeah after extensive troubleshooting with multiple AT&T reps, replacing my SIM card multiple times and even trying my sisters AT&T SIM with the same error it is official that AT&T does not like non-AT&T phones. I got a prepaid T-Mobile SIM and popped it in to try it our for a month and boom Supplementary services works like a charm with it. So looks like I have to live with it until I decide to pull the trigger and switch to T-Mobile.
For everyone else who stumbles into this thread via google, you will get nowhere really with AT&T reps, nothing they do will fix this as it is an issue with AT&T itself and not the phone. So if you want to use call forwarding you will need to reach out to AT&T directly and have them set it up as not even MMI codes work... or just switch to T-Mobile. Hopefully AT&T does some backend changes to fix this and get it working but not holding my breath.

eL_MeXiCaNo said:
You don't own stock? Well too bad, I'm sure my extra $50 a month would of made you a billionaire :laugh: xD
But yeah after extensive troubleshooting with multiple AT&T reps, replacing my SIM card multiple times and even trying my sisters AT&T SIM with the same error it is official that AT&T does not like non-AT&T phones. I got a prepaid T-Mobile SIM and popped it in to try it our for a month and boom Supplementary services works like a charm with it. So looks like I have to live with it until I decide to pull the trigger and switch to T-Mobile.
For everyone else who stumbles into this thread via google, you will get nowhere really with AT&T reps, nothing they do will fix this as it is an issue with AT&T itself and not the phone. So if you want to use call forwarding you will need to reach out to AT&T directly and have them set it up as not even MMI codes work... or just switch to T-Mobile. Hopefully AT&T does some backend changes to fix this and get it working but not holding my breath.
Click to expand...
Click to collapse
can you get ATT VoLTE working with N975F? If yes, how?

AT&T tech support said my OP7T not LTE Compatible

It's HD1907 T-MOBILE. What I need is HD1905. He sent me the wrong one.
I only realized a few hours ago I had no mobile data. I had got calls and texts to work this morning.
After spending 45 minutes on the phone with AT&T they concluded my phone is not recognized as LTE compatible. WTF? It's not even connecting to 3g.lb
I've been buying unlocked phones for years. My last phone was OP5T. I've never experienced anything like this.
I'll probably take it to the corporate store tomorrow but doubt it'll help. Has anyone had problems with AT&T and this phone?
I'm just putting it out there, hoping somebody has an idea...

AT&T worked for me, excellent data speeds, and great signal. But at times it would go from 4 bars to absolutely no signal or data, and lots of dropped calls. After that I went to Verizon, not as good of signal, slower data, but no dropped phone calls or mysterious total loss of signal in an area where it should have been 4 bars.

Droid_Nut said:
AT&T worked for me, excellent data speeds, and great signal. But at times it would go from 4 bars to absolutely no signal or data, and lots of dropped calls. After that I went to Verizon, not as good of signal, slower data, but no dropped phone calls or mysterious total loss of signal in an area where it should have been 4 bars.
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I'll bet if you look in the settings your model is HD1905 or the global model, not sure the number.
Actually if you could take a look for me and post back here that'd be good. It most likely won't make a difference but I'm curious.

KLit75 said:
I'll bet if you look in the settings your model is HD1905 or the global model, not sure the number.
Actually if you could take a look for me and post back here that'd be good. It most likely won't make a difference but I'm curious.
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Yes I have the HD1905, but you can totally forget about vowifi with any provider except for T-Mobile. I tried them all, I even had a tech from VZW work diligently to try and get vowifi working. I told him to try and add my IMEI to the approved list, and that did not work either. As far as AT&T, they did not give me the time of day, they just told me I needed and AT&T device, period.

Droid_Nut said:
Yes I have the HD1905, but you can totally forget about vowifi with any provider except for T-Mobile. I tried them all, I even had a tech from VZW work diligently to try and get vowifi working. I told him to try and add my IMEI to the approved list, and that did not work either. As far as AT&T, they did not give me the time of day, they just told me I needed and AT&T device, period.
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You mean Verizon when you say VZW?
I'm just confused as to how he would be able to add it to the list of approved devices.
Anyway it's BS. If the carrier supports the phone, and the phone is capable of VOLT!/WIFI CALLING, it should work.

KLit75 said:
You mean Verizon when you say VZW?
I'm just confused as to how he would be able to add it to the list of approved devices.
Anyway it's BS. If the carrier supports the phone, and the phone is capable of VOLT!/WIFI CALLING, it should work.
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Yes Verizon. I have heard hear many times on this site, that phones are blocked from wifi calling by the IMEI, I or they could be wrong.
Vowifi works on the unlocked Pixel, but are they going to butt heads with Google? Volte works fine, I got a network extender, and I can use google voice to make calls over wifi if I really need to.
If vowifi is a must, get an approved phone, that is all you can do.

Droid_Nut said:
AT&T worked for me, excellent data speeds, and great signal. But at times it would go from 4 bars to absolutely no signal or data, and lots of dropped calls. After that I went to Verizon, not as good of signal, slower data, but no dropped phone calls or mysterious total loss of signal in an area where it should have been 4 bars.
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Click to collapse
I worked at AT&T until a few months ago. I can tell you confidently that their tech support is a bunch of dummies. Employees have their own tech support line to call and that one is just as bad. They would routinely tell customers they needed to go to a store to have something done. Then they'd get to the store to find out we literally cannot do that at the store. Stuff like that was super common. One of them even bet me $1,000 that iPhones DON'T reboot when they update, which we all know is all the way wrong.
I halfway think support tells people that stuff on purpose to try to get them to buy something from AT&T. God, I could rant about that place for hours lol

redemptionx11 said:
I worked at AT&T until a few months ago. I can tell you confidently that their tech support is a bunch of dummies. Employees have their own tech support line to call and that one is just as bad. They would routinely tell customers they needed to go to a store to have something done. Then they'd get to the store to find out we literally cannot do that at the store. Stuff like that was super common. One of them even bet me $1,000 that iPhones DON'T reboot when they update, which we all know is all the way wrong.
I halfway think support tells people that stuff on purpose to try to get them to buy something from AT&T. God, I could rant about that place for hours lol
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Maybe you can answer this for me. Just because a T-MOBILE locked phone is able to make calls and texts on AT&T, does that automatically mean it should be able to connect to mobile data?
I was able to get it to make calls after a refresh signal was sent out, but it could not connect to mobile data . My sim is fine. I even popped it my son's Pixel 3a and LTE started immediately.
The seller is saying the fact that it was able to make calls means it is able to connect to mobile data. And I should take it to AT&T before returning it. I don't think he's scamming. He says he has the same phone on AT&T. And he's sold Hundreds of them. That kinda checks out based on reviews and some of those people do report it works with AT&T.
These phones are hd1907 T-Mobile but supposedly OnePlus unlocks them before sending them out to some sellers. I sort of believe the guy but is it true? If it were locked to T-Mobile could I get it to make phone calls?
Obviously I'm not talking about a hack. Because I thought locked was locked. Is it possible for a locked T-Mobile phone to make calls on the AT&T network?
Also I got AT&T to make it work but once I removed the sim/reinsert it, the thing displays weird behavior. Wifi goes in and out. It forgets the apn settings that were set prior.

redemptionx11 said:
I worked at AT&T until a few months ago. I can tell you confidently that their tech support is a bunch of dummies. Employees have their own tech support line to call and that one is just as bad. They would routinely tell customers they needed to go to a store to have something done. Then they'd get to the store to find out we literally cannot do that at the store. Stuff like that was super common. One of them even bet me $1,000 that iPhones DON'T reboot when they update, which we all know is all the way wrong.
I halfway think support tells people that stuff on purpose to try to get them to buy something from AT&T. God, I could rant about that place for hours lol
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I agree, ATT was the most horrible experience I ever had. Tracfone may have even had a better customer support.
Verizon CDMA service may be antiquated, but their customer service and tech support is 2nd to none.

KLit75 said:
Maybe you can answer this for me. Just because a T-MOBILE locked phone is able to make calls and texts on AT&T, does that automatically mean it should be able to connect to mobile data?
I was able to get it to make calls after a refresh signal was sent out, but it could not connect to mobile data . My sim is fine. I even popped it my son's Pixel 3a and LTE started immediately.
The seller is saying the fact that it was able to make calls means it is able to connect to mobile data. And I should take it to AT&T before returning it. I don't think he's scamming. He says he has the same phone on AT&T. And he's sold Hundreds of them. That kinda checks out based on reviews and some of those people do report it works with AT&T.
These phones are hd1907 T-Mobile but supposedly OnePlus unlocks them before sending them out to some sellers. I sort of believe the guy but is it true? If it were locked to T-Mobile could I get it to make phone calls?
Obviously I'm not talking about a hack. Because I thought locked was locked. Is it possible for a locked T-Mobile phone to make calls on the AT&T network?
Also I got AT&T to make it work but once I removed the sim/reinsert it, the thing displays weird behavior. Wifi goes in and out. It forgets the apn settings that were set prior.
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It should have no trouble using data BUT you'll have to change the phone's APN settings to match your carrier before you can. You can google it and find them. It's not hard at all to change. Somewhere under the "network" settings.
Someone correct me if I'm wrong, but as I've understood it the phone will keep trying to access the previous carrier's data network, which is why you didn't have data. But as said above the APN settings should fix that.

redemptionx11 said:
It should have no trouble using data BUT you'll have to change the phone's APN settings to match your carrier before you can. You can google it and find them. It's not hard at all to change. Somewhere under the "network" settings.
Someone correct me if I'm wrong, but as I've understood it the phone will keep trying to access the previous carrier's data network, which is why you didn't have data. But as said above the APN settings should fix that.
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If I told you the whole story, which started on Friday morning and in the end involved 7 AT&T employees, 6 on the phone and 1 in the store, it'd probably be removed because it's spam. Too long of a story.
But in the end it didn't get to connect to mobile data..at least not consistently. I took it to the store. The guy removed the Sim reset it, turned it off and boom! - LTE, calls and texts. His theory was it takes a little while for it to unlock and get set so when I tried it the other night it wasn't working.
I was happy because it literally took 5 minutes. I ran some errands and was out for like another 2 hours. Everything was working. Some point between the store and my driveway, the signal was gone. I never got it back. Of course I tried reset, remove Sim, reboot, change apn settings.
I called AT&T... the first woman didn't even know what CDMA and GSM was. I politely got her to transfer me to the guy who 'knows his stuff'. He got it to make calls again, but in the end concluded this device can't work on this network. I didn't wanna argue anymore. He had a BS answer for everything including 'If it doesn't work, why DID it work just a half hour ago?'
He said I could try getting a new sim. They have no idea. My son's sim won't work on this phone but pop it in my old phone and it works. And my sim works in his phone. It's not the sim. I know it.

KLit75 said:
It's HD1907 T-MOBILE. What I need is HD1905. He sent me the wrong one.
I only realized a few hours ago I had no mobile data. I had got calls and texts to work this morning.
After spending 45 minutes on the phone with AT&T they concluded my phone is not recognized as LTE compatible. WTF? It's not even connecting to 3g.lb
I've been buying unlocked phones for years. My last phone was OP5T. I've never experienced anything like this.
I'll probably take it to the corporate store tomorrow but doubt it'll help. Has anyone had problems with AT&T and this phone?
I'm just putting it out there, hoping somebody has an idea...
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That's strange as they both litterly have the same bands besides 71 that 1907 has

This is att bands and oneplus bands

If u haven't tryed I would recommend using the failed to go to your settings and toggle around there all bit make sure it's set for north america

rob420p said:
That's strange as they both litterly have the same bands besides 71 that 1907 has
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I took it back to AT&T yesterday. There was someone in front of me so I sat down, removed the sim from my working phone, popped it in the op7t... instant lte, calls & texts. The same thing happened the day before I went to at&t. It worked perfectly well there in the store and even 2 towns away but not m my neighborhood which DOES connect to LTE, has for years on every phone we've had.
The tech (if you can really call him that) updated the sim. That got it done. I've had a working phone for 24 hours. BUT no LTE. It only connects to H+.
I haven't had time to call or go back to the store, but I'm hoping it's an easy fix. This has been the weirdest week I've ever had dealing with a phone. I've learned that AT&T doesn't know what they're doing. I still can't believe I needed to explain what GSM and CDMA was to one of the people on the call.
I'm gonna try a few things tonight after work.

KLit75 said:
I took it back to AT&T yesterday. There was someone in front of me so I sat down, removed the sim from my working phone, popped it in the op7t... instant lte, calls & texts. The same thing happened the day before I went to at&t. It worked perfectly well there in the store and even 2 towns away but not m my neighborhood which DOES connect to LTE, has for years on every phone we've had.
The tech (if you can really call him that) updated the sim. That got it done. I've had a working phone for 24 hours. BUT no LTE. It only connects to H+.
I haven't had time to call or go back to the store, but I'm hoping it's an easy fix. This has been the weirdest week I've ever had dealing with a phone. I've learned that AT&T doesn't know what they're doing. I still can't believe I needed to explain what GSM and CDMA was to one of the people on the call.
I'm gonna try a few things tonight after work.
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That is strange and pethetic the att peaple.dont know what they are doing.if I have time later I'll try to research she if anything comes out

rob420p said:
This is att bands and oneplus bands
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Thanks for sharing, but I've never really needed to mess around with the settings as far as mobile data goes. It either works out of the box, or at most I'll need to put the apn in manually on some custom roms, but even that's rare.
How does the info you provided apply to my problem. I know the phone can connect to lte. It was connecting briefly on Monday afternoon and while I was at At&T yesterday, it connected before they updated the sim.
Is there something I can do with this? It's a sincere question. I'm not sure if I can apply it somehow. Thanks

KLit75 said:
Thanks for sharing, but I've never really needed to mess around with the settings as far as mobile data goes. It either works out of the box, or at most I'll need to put the apn in manually on some custom roms, but even that's rare.
How does the info you provided apply to my problem. I know the phone can connect to lte. It was connecting briefly on Monday afternoon and while I was at At&T yesterday, it connected before they updated the sim.
Is there something I can do with this? It's a sincere question. I'm not sure if I can apply it somehow. Thanks
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I think his point was to show that the OP7T does in fact work on all AT&T bands. Normally you don't need to do anything with this if the SIM is provisioned correctly.
What are the chances that you are on the edge of the local AT&T LTE signal so it drops to H+ because that's a stronger connection? At the AT&T store the LTE signal is stronger so the phone is favoring that one. Some phones are more sensitive to signals than others (or more aggressive at switching to a stronger band).
Try using a program like "LTE Discovery" and see what bands you actually are connecting to. It can also let you know what is going on in your area with tower location.

Lost Dog said:
I think his point was to show that the OP7T does in fact work on all AT&T bands. Normally you don't need to do anything with this if the SIM is provisioned correctly.
What are the chances that you are on the edge of the local AT&T LTE signal so it drops to H+ because that's a stronger connection? At the AT&T store the LTE signal is stronger so the phone is favoring that one. Some phones are more sensitive to signals than others (or more aggressive at switching to a stronger band).
Try using a program like "LTE Discovery" and see what bands you actually are connecting to. It can also let you know what is going on in your area with tower location.
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I'll try that. Thanks.
That's what I said but the guy at the store said it's really not a stronger signal at the store. Plus I know I can get LTE at my house and in the store because all our other phones connect, even this one, briefly at the at&t store.
The seller have me a code to input into the dialer but I'm waiting for tomorrow to put it in. It's my day off. If something goes wrong it won't be a huge deal. I will look into what you sent at some point though.

Droid_Nut said:
Yes I have the HD1905, but you can totally forget about vowifi with any provider except for T-Mobile. I tried them all, I even had a tech from VZW work diligently to try and get vowifi working. I told him to try and add my IMEI to the approved list, and that did not work either. As far as AT&T, they did not give me the time of day, they just told me I needed and AT&T device, period.
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Your posts are bouncing between VoLTE & VoWiFi.
LTE bands and VoLTE work fine on Verizon's network.
Verizon allows VoWiFi on the OP 8's that they sell. They will not activate VoWiFi on the OP 7 series, the claim is that the phone did not go through their security testing. IIRC VZW doesn't allow VoWiFi on any outside phone.