Develop Bugs

[Q] SIM card broke my two phones (can only make calls while just 2g is enabled)

Hi, I recently started having trouble with my gf's phone (Nexus 4 running lollipop 5.0, lte enabled, tmo). It started shortly after I enabled a SIM lock pin on the sim, but not sure if that's the cause or not... The phone started to intermittently drop signal, and would not make calls (it would just appear to be dialing, but you'd hear no ringing and never connect). When I'd restart the phone, I could usually make a call. I tried to fix it by restoring everything the stock image, rechecking the apn, making sure stock radio was installed, etc, but the problem persisted and eventually got to the point that voice calls did not work at all. LTE and data worked to get onto the internet, but once a call was attempted to be made, it'd lose all signal. I discovered eventually that if I switched off lte/4g/3g, and only kept gsm 2g on, I could make a voice call. Next I tried her SIM card in my phone (Note 2 on Android 4.4, t-mobile) and as soon as I put her sim in, my phone started doing the same thing. After switching back to my SIM (that was working just fine, before), now MY phone is stuck with the same problem! (Can only make calls with just 2g enabled). I'm at a total loss. Has anyone experienced anything similar, or do you have possible solutions/ideas on how to fix this?

Solved
For anyone who may be having the same problem, here is how I solved it. I picked up a new sim card from t-mobile, flashed a stock rom via odin (with the sim card not installed), loaded rom, and installed sim, loaded correct apn. Everything works as it should now.

Reply
What Brand was her SIM?

Can't place or receive calls; LTE data and SMS works fine

Hey guys, just unwrapped my new N5x and popped in my sim card. Yet for some reason I can't make or receive any calls!
Calls to me go straight to voicemail, and when making an outgoing call it either immediately says call ended or after a while says network unavailable.
The strange thing is that the entire time I'm connected to LTE (full bars) and data works fine (I can use chrome), and I can even send and receive SMS!
It's been like this straight out of the box. I reset the network settings, then factory reset the device, then upgraded to 6.0.1, rinsed and repeated with no luck.
Probably related: I tried setting the phone from LTE preferred to 3G or 2G but it still says connected to LTE. Even did it manually from the *#*#4636#*#* and nothing changed.
I'm using HOT Mobile in Israel and the American version of the phone. All bands are here are supported.
Any thoughts on how to proceed?

Do US specifc models of phones normally work fine in Israel?
I know I had these symptoms when I managed to accidentally swap my UK model to use USA bands. Only potential difference is that I don't think SMS worked for me.
If someone more knowledgeable knows where the "Network settings reset" pulls values from and to, that might help.
Or which partition holds the data that makes a US phone a US version and an EU phone an EU version (assuming it isn't hardware), we could potentially flash stuff.

Yeah they do. I have a friend with a 5x and his phone is working fine. :/

Check your apn settings, re add them again to test.
Maybe your network do not support lte calls, try it on 3g. This was my solution even thought my network supported volte and worked on s6 but not on my 5x.
I see you tried the 3g option, my problem was another app causing the conflict between lte and 3g. Able to source for another spare sim to try?

I deleted the apn settings - no luck. tried 2 different service providers and same results with both
I havnt installed anything yet and wiped the phone to be sure. Could a stock app be causing the conflict? How can I check?

did you try having your friend put his sim in your phone and yours in his to see if it works?

Yep - he's on the same service provider that I am. Didn't work. Also tried a Sim card from a different service provider.

Here is a solution if you still need it http://forum.xda-developers.com/showpost.php?p=64023143&postcount=10

Problem with using on ATT

Hey So I'm having some issues after sim unlocking phone;
I sim unlocked my phone and then flashed it back using odin to stock and still having issues.
Issues:
-While it says LTE the device does not seem to be getting actual LTE as doing a speed test revealed about 2-3 mbps
-When calling someone, they can rarely hear me
-When someone calls me I can't answer the call, I swipe to answer and the phone hangs then shows the call screen again and I try to answer the second time it usually disconnects the call
-When I am able to answer the call no audio and the call automatically hangs up after about 5 seconds
I know that the microphones are good as I can make calls using FB Messenger and don't have any issue since it's using the data.
Steps I have done:
-Flashed back to stock
-Factory Reset after Flash
-Manually set network to: AT&T
-Disabled WiFi calling
-Set network to 2g/3g to see if the LTE was causing the issue
....none of this seems to have made any difference in the issue.
Any recommendations, suggestions, in-sight would be great! Wondering if I should just sell this and get an ATT phone or if I can fix the issue.
I had read in some thread that someone had to get a new sim but from what I remember of the thread they weren't seeing anything data or the ability to select a operator. The phone the SIM originally came from was a iPhone 5C if that makes any difference.

This worked for me:
1) Use an "activity launcher" app to launch Device Info com.android.settings.radioinfo (there is one by that name in the Play Store that I use; Alternatively, Nova Launcher has a handy widget function to launch activities.)
2) Once Device Info/Radio Info is open, there is a drop down menu mid-way down the page that allows you to select various combinations. The default is intended for TMOBILE networks.
For AT&T, select "LTE/GSM (Auto)"
3) Reboot the phone
While the Radio Info settings updated to "LTE/GSM (Auto)" did immediately resolve the mobile data issues on AT&T for me, checking your active APN (that's it's using the AT&T Nextgen APN) might be worthwhile as well.

The program I actually tried to do this with was "4G LTE Switcher"; I had used it back with my XT912(Droid Razr Maxx) because it had lots of problems with custom roms and not connecting to the network and I tried those methods:
1. Turn on airplane mode and turn back on to establish connection after power on
2. Turn on airplane mode, power cycle
3. 4g Switch/ Turn data to CDMA only and then back to LTE (when was on verizon)
Things I've noticed:
1. If I'm on wifi the call audio never works even though I have disabled wifi calling
2. If I'm on LTE the call never works and for some reason like the phone doesn't want to switch over to HSPA
3. If I'm on HSPA+ it works more often on incoming calls than outgoing
I got a new sim card from ATT and had them add the IMEI into the system but didn't help at all.
Nougat should be out soon and hoping that I can get it fixed, going to try some rom flashing and CSC flashing to see if I can get a result out of it

I got my s6 edge plus in a trade, i was able to get it unlocked finally and was wondering if there is an unbranded rom that can be installed on the tmobile variant ? I have at&t as well.

No data during call after oreo update

Hello. I'm hoping that someone can help me out. I have a Verizon note 8 that i use on straight talk for the longest it never would update to oreo but then i cracked the screen and purchased another used verizon note 8 from ebay. It came to me with a cricket sim card in it. I turned it on and connected it to wifi just to check it out before i transferred anything and it immediately wanted to update so i let it and it updated to oreo. I swapped over my ST sim into the new phone and stuck the cricket sim into the old phone and it updated too. But now my problem is that I keep getting the message that data is unavailable during calls. When i check the settings it says i am on CDMA/EVEDO/GSM/WCDMA. And there is no option to edit my APN. If i click on the mobile network i have the option for LTE/3G/2G but if i choose this nothing works and i have no option to go back to the CDMA/EVEDO/GSM/WCDMA and thus have to do a factory reset. I have tried texting APN to 611611 but it states my APN is already setup. I called tech support for ST and they told me to call back from another phone which i cant do until this evening when i get off work. So i thought in the mean time i would reach out to the real pro's on here and see if anyone else has had this issue. Did i mess up by updating with the cricket SIM inserted? Or could it be that i just didnt call straight talk when i swapped phones? i just took the sim card out of one phone and stuck it in the other. I really appreciate any advice anyone may have. Oh and I've tried finding the settings for HD calling to enable them, not there.
Thanks,
Amy

I'm having this same issue with my Verizon branded note 8 that I manually updated to Oreo. I called my carried, Red Pocket and they stated that this is enabled for my account. In Oreo the hidden menus seem to be disabled and I've tried other things. I may have to see if I can go back to Nougat. The dialer hidden menu I tried was *#2683662#. On the Verizon forums, other were able to get to the menu using *#4636# and enable VoLTE but that seems to be disabled for me. I tested from my coworkers note 8 and it seems to work fine on their phone.

sixtythreechevy said:
I'm having this same issue with my Verizon branded note 8 that I manually updated to Oreo. I called my carried, Red Pocket and they stated that this is enabled for my account. In Oreo the hidden menus seem to be disabled and I've tried other things. I may have to see if I can go back to Nougat. The dialer hidden menu I tried was *#2683662#. On the Verizon forums, other were able to get to the menu using *#4636# and enable VoLTE but that seems to be disabled for me. I tested from my coworkers note 8 and it seems to work fine on their phone.
Click to expand...
Click to collapse
I reflashed CRID and the CSC but my Service Provider SW ver. still says VZW/XAA/VZW. Does anyone know how to fix this?

Has anyone figured this out? I am having this very issue and Straight Talk has no clue what I am talking about.

I found this on the Samsung website and it looks promising but nothing has changed. I was able to see that the radiobutton/checkbox for LTE Enhanced is checked.
To enable HD Calling, download Shortcut Master (Secret Codes) Lite from developer vndnguyen. You will need to find the apk as it does not appear to be in the play store any longer.
1) From the option menu located in the upper right hand corner, choose Search.
2) There is a search field at the bottom of the screen. Type lte then hit the Search key.
3) Scroll down to Mobile Networks. Choose the one that show EnhancedLteServices. Then click Launch. Then click the box to enable HD Calling.
I was also able to set the APN settings to Bearer: unspecified using Shortcut Master lite but this made no difference whatsoever.
Finally, you don't need to do a factory reset each time you go from CDMA/EVEDO/GSM/WCDMA to LTE/3G/2G (auto connect), simply search in settings for reset network and then reset the network settings and reboot.

I was able to get the SIM card trick to work for me on my Note 8 as well. I have redpocket and prior to doing the sim card trick I did not have VoLTE. Now I do. It's too bad that this is majorly inconvenient and it won't stick after a reboot, by the sounds of it. I haven't tried yet. I may just tape the sim to the back of my phone or inside my case. Also, on my Note 8 prior to this, I was seeing vzw/xaa/vzw and now it has the vzw/vzw/vzw CSC with the RP sim in. I'm hoping that there is another way to fix this but at least I have a work around.

I updated to Oreo on my verizon note 8.
I dont have any options for advanced HD Calling, Wifi calling.
When I go to ims settings it says denied.
Any ideas

dpoverlord said:
I updated to Oreo on my verizon note 8.
I dont have any options for advanced HD Calling, Wifi calling.
When I go to ims settings it says denied.
Any ideas
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Click to collapse
I answered you on the other thread just so know..

LG G710ULM UNSUPPORTED VoLTE ?!? (Straight-Talk US - T-Mobile network)

*********UPDATE********** I bought a new sim from straight talk and VOLTE works now! (GSM compatible Straight Talk Sim card) My old sim was from 2014, so it wasn't VOLTE compatible.
I have an ebay zombie LG G710ULM flashed to latest Google Fi Android 9 software, I received an email from Straight Talk (Wal-Mart US cell phone service reseller) telling me that my LG G7 does not support VoLTE and my phone will be unable to receive calls in January 2021.
-Using a network info app, the app is telling me it is connected to T-Mobile towers (so I have a Straight Talk T-Mobile compatible SIM)
-I can't find any options to enable VoLTE in settings, and wifi calling is erroring out
I was wondering if there are ways to get VoLTE and Wifi Calling working (Straight Talk supports it, but not my current ROM/SIM).
I can switch to the following sims supported by Straight Talk.
-AT&T Compatible Sim
-Verizon Compatible Sim? If my phone supports CDMA bands
OTHERWISE MOST OF US WILL HAVE A PAPERWEIGHT IN 2021!!!!!!!!!

Same problem
I'm having the same problem. Any progress on this?

I'd like to know this too. Surprised there is no traffic here with all the knowledgeable people on this forum.
G710EAW here. BTW There was an Android 10 update just two hours ago from Android 9. Someone with an 'EM' phone in another thread said VOWifi is "working now" but how do others know if it's working when January 1st comes around?

Falkentyne said:
I'd like to know this too. Surprised there is no traffic here with all the knowledgeable people on this forum.
G710EAW here. BTW There was an Android 10 update just two hours ago from Android 9. Someone with an 'EM' phone in another thread said VOWifi is "working now" but how do others know if it's working when January 1st comes around?
Click to expand...
Click to collapse
If you guys have cross flashed roms, then volte will not work. It doesnt work for any of us who have crossflashed. Whichever model.
You need to be on original software. Looks like some licensing thing that volte requires. They need to provision volte for all the phones. Sounds like they are not interested to provision it for g7. Odd that even EAW model which has original firmware, they sent that mail too....
Sad/Odd to see your carriers are suddenly changing to only Volte.

Is there a way to put it back to original software? I actually don't need it crossflashed to anything because it's a Verizon originally and I would like to use it on that network. Or does it not work that way?

Turnhoo said:
Is there a way to put it back to original software? I actually don't need it crossflashed to anything because it's a Verizon originally and I would like to use it on that network. Or does it not work that way?
Click to expand...
Click to collapse
Main issue is that your carriers dont want to provision volte for your G7s. So no guarantee if cross flashing back to original will work.
There is crossflashing guide in guides section with which you can go back to stock firmware. Do this at your own risk.
In our country we have a volte carrier called Jio. They provide an app called jiocall. Using that app you could use their service even if your phone is not volte capable. You will have to see if there are such apps for your carrier. Thats the only non technical, simpler solution.

I have some information that might make all of you guys happy.
I was told by Safelink Wireless that VOTLE is a function of BOTH the phone *AND* the sim card.
Basically, if the phone itself is VOLTE compatible but the sim card is not, then the phone will be reported on their system as not compatible, and will ask you to upgrade your phone.
However if a VOLTE compatible SIM is inserted, if the phone does in fact support VOLTE, it will then work. That's because it's provisioned on the carrier via the sim card itself.
If you purchased a sim via the "Buy your own sim" package, e.g. online or from Best Buy, etc, awhile ago, then that sim is not compatible. You simply need to call Tracphone/Safelink and ask to buy a VOLTE compatible SIM (which costs 99 cents). Then when you get it, call their tech department to have them transfer the phone service and phone number to the new SIM.
You can dial the phone's service menu and go to the VOLTE/GPRI menu and if the options are there, then the phone supports it.

What's the correct service menu number for our phones?

Falkentyne said:
I have some information that might make all of you guys happy.
I was told by Safelink Wireless that VOTLE is a function of BOTH the phone *AND* the sim card.
Basically, if the phone itself is VOLTE compatible but the sim card is not, then the phone will be reported on their system as not compatible, and will ask you to upgrade your phone.
However if a VOLTE compatible SIM is inserted, if the phone does in fact support VOLTE, it will then work. That's because it's provisioned on the carrier via the sim card itself.
If you purchased a sim via the "Buy your own sim" package, e.g. online or from Best Buy, etc, awhile ago, then that sim is not compatible. You simply need to call Tracphone/Safelink and ask to buy a VOLTE compatible SIM (which costs 99 cents). Then when you get it, call their tech department to have them transfer the phone service and phone number to the new SIM.
You can dial the phone's service menu and go to the VOLTE/GPRI menu and if the options are there, then the phone supports it.
Click to expand...
Click to collapse
Update, I recently bought a new sim and I have VOLTE right now on ULM android 9 latest security fix LG G7 image, running on Straight Talk.

took a while to understand lgup but my 710 oulm had a type oreo that the guy said couldnt be but i crossed flashed it to 10 i dont see the rom anymore and i hope i put it on another drive it was a canadian rom for android 10 works great otherwise im looking to get volte active in the *#*#4636#*#* phone menu you can see "provision for the setting under the radio on off but its a grey area the buttons dont work could be good could be bad its definately part of 10 but ?? grey areas preferred network could be sketchy to play with the phone initially on transition had incredible link up speed now its giving me a pain because assume i played with the connection preferences tab and its a registration error like dum just use the assigned sim guys and stop trying to mac or identify with every device anyway its the registration of a telephone number robo heads