Develop Bugs

Can't get LTE + Network to work

Hey guys! I recently bought a G3. It's a Korean Variant LG-F400L from U+. My problem with this phone is that when set to "Global" mode (GSM/WCDMA/LTE) it connects to LTE but says "Not in Service Area" whenever I try to make a call so I don't get the normal call and text services but when I set my network mode to (WCDMA Only) I get the call and text service but no LTE only 3G. So maybe Global mode prioritizes GSM? I don't know.
If I do LTE only mode, I can receive texts I believe but I can't make phone calls. I know it is not a problem with my network, as I have a Galaxy Note 3 and LTE + Calls work fine on my Note 3. Yet this G3 will only do one or the other. There is no option from WCDMA + LTE only.
IF anyone has any ideas, I would love to hear it. I'm also wondering if changing the rom would help this issue.
I should also mention that I am on another provider (SK Telecom) while my phone is a unlocked U+ phone!

Metsuna said:
Hey guys! I recently bought a G3. It's a Korean Variant LG-F400L from U+. My problem with this phone is that when set to "Global" mode (GSM/WCDMA/LTE) it connects to LTE but says "Not in Service Area" whenever I try to make a call so I don't get the normal call and text services but when I set my network mode to (WCDMA Only) I get the call and text service but no LTE only 3G. So maybe Global mode prioritizes GSM? I don't know.
If I do LTE only mode, I can receive texts I believe but I can't make phone calls. I know it is not a problem with my network, as I have a Galaxy Note 3 and LTE + Calls work fine on my Note 3. Yet this G3 will only do one or the other. There is no option from WCDMA + LTE only.
IF anyone has any ideas, I would love to hear it. I'm also wondering if changing the rom would help this issue.
I should also mention that I am on another provider (SK Telecom) while my phone is a unlocked U+ phone!
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Hi! I guess you're in Korea? Have you tried another sim card? Is this a new phone or did you purchase it second hand?
EDIT : It sounds like a network problem.. The phone hasn't been registered correctly.

Did you make sure you have the right APN settings?

So I actually changed my mobile provider to u+ because I was off contract and my phone was able to get VoLte and LTE. So maybe the issue was the phone defaulting to VoLte? I have no idea how to turn it off on this F400L model. I've tried most of the methods I think. Any ideas how to turn it off? Either way I guess it's a little bit solved now that I can call again.

I am having the same problem
Hello Metsuna
Can you tell me how you solved the problem, I am having the same problem and cant connect to internet. Can;t make or receive any calls.
Thanks

Question for AT&T LTE users

So I get LTE but as soon as I get on a call signal goes to H and I cant use data/apps while on the call. Am I using the wrong APN settings, or wrong radio maybe? Any settings help would be great, or if you can confirm also. Thanks.

Mine nexus 6 did same thing. I'm not sure that the data still work or not but everytime I on call I see LTE Icon change to H like you said

It's one of 2 things.
Either VoLTE is not turned on on your device
Or ATT does not support VoLTE in your area.
First one is fixable. Second one is not.
Sent from my MI 5 using Tapatalk

TheDriller said:
It's one of 2 things.
Either VoLTE is not turned on on your device
Or ATT does not support VoLTE in your area.
First one is fixable. Second one is not.
Sent from my MI 5 using Tapatalk
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AT&T doesn't support VoLTE on any phones that aren't sold by them.

StykerB said:
AT&T doesn't support VoLTE on any phones that aren't sold by them.
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Then that would explain that I would think

LTE is data only, so when u go on a voice call it will got to hsdpa or 3g bc that is voice and data, so it is normal

Bradl79 said:
LTE is data only, so when u go on a voice call it will got to hsdpa or 3g bc that is voice and data, so it is normal
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Please don't spread information that's no longer the 100% truth. AT&T, Verizon, and (for a while now) T-Mobile offer calling over their LTE network, dubbed VoLTE (Voice over LTE). It allows voice packets to travel over the LTE network instead of legacy/3G and older networks.
The way the standard it set up, devices made more recently have software and hardware support for it, but as carriers have certification processes for their network, not all devices work cross-carrier. Most notably, iPhones (bleh) work cross-carrier because of the way their network configuration is provisioned (device identifies what network it's on, and downloads carrier configuration for that particular network). Some Android devices work cross-carrier (Nexus 6P and 5X), but the manufacturers of Android devices designing unlocked devices for some reason aren't certifying on AT&T, maybe because of cost or complexity.
Therefore, there are 3 main reasons VoLTE won't work on a device:
1) Not in a VoLTE area
2) VoLTE not enabled (this could encompass the option simply being disabled per the user)
3) VoLTE being restricted (AT&T restricting access because the device isn't certified, and/or the device not being capable)
Read up more on the requirements for AT&T (specifically) here:
http://att.com/hdvoice

balleron24z said:
Please don't spread information that's no longer the 100% truth. AT&T, Verizon, and (for a while now) T-Mobile offer calling over their LTE network, dubbed VoLTE (Voice over LTE). It allows voice packets to travel over the LTE network instead of legacy/3G and older networks.
The way the standard it set up, devices made more recently have software and hardware support for it, but as carriers have certification processes for their network, not all devices work cross-carrier. Most notably, iPhones (bleh) work cross-carrier because of the way their network configuration is provisioned (device identifies what network it's on, and downloads carrier configuration for that particular network). Some Android devices work cross-carrier (Nexus 6P and 5X), but the manufacturers of Android devices designing unlocked devices for some reason aren't certifying on AT&T, maybe because of cost or complexity.
Therefore, there are 3 main reasons VoLTE won't work on a device:
1) Not in a VoLTE area
2) VoLTE not enabled (this could encompass the option simply being disabled per the user)
3) VoLTE being restricted (AT&T restricting access because the device isn't certified, and/or the device not being capable)
Read up more on the requirements for AT&T (specifically) here:
http://att.com/hdvoice
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Click to collapse
So how do you enable on the OP3 with AT&T?

SysAdmNj said:
So how do you enable on the OP3 with AT&T?
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You can't, only thing that would remotely make it work is if your imei was set up as a HDVoice supported phone in AT&T's system (s6, s7, note 5, note 7, iphone, etc). Though that likely won't work either since it'll try to provision the VoLTE and fail and yea.

AT&T does not use "Standard" VoLTE, so even if the phone supports it (like the OP3 does) and they were to allow the IMEI, it still wouldn't work. Phones have to have specific code from AT&T to do their HDVoice (according to their own customer service postings in their forums)

Galaxy Watch Active 2 LTE - Unable to make/receive calls

Hi folks,
I recently bought an Active Watch 2 and already have a Vodafone UK mobile account to which I added the One Number service.
I've discovered that on my watch while on 4G, I cannot make or receive phone calls.
There is definitely a data connection there, as I can send a text message or use the Internet browser app to view a website.
What happens is I dial a number, I get 2 beeps and then a Call Ended message. I've spent over 10 hours on the phone/chat to Vodafone trying to get this resolved to no avail. I've done a number of resets, SIM swaps etc.
This morning I noticed on the watch under Settings in the Phone app, that there is an option for "Preferred Number for Calls" which is greyed out and set to 'Watch'. I'm sure at one point when I first got the watch I was able to select Phone or Watch. Could this have something to do with it? Is the VF network blocking the call because the watch is trying to phone from the One Number secondary number instead of my contract phone number ?
Any help appreciated!

Hey there.
I have the exact same problem myself, my carrier is o2 and have an Active2 LTE.
Set everything up through the esim QR Code. I am the £5 data per month, and yet am unable to make or receive phone calls through LTE / Wi-Fi. No issues though with data and messaging.
It occasionally worked when I first set it up a couple of months ago, but since the latest Tizen update to 5.0 something, there is no option under 'remote connection' in the Galaxy Wearable app to make/receive calls. When testing my original Galaxy Watch out, the call option is there and it is on Tizen 4.0 and I am able to make WiFi calls.
At first I thought the issue was with o2 but am now thinking it is related to Samsung services. Via Bluetooth the Active2 works fine with call functionality but through WiFi/lte, nothing. The odd issue as well, is that, when testing through LTE on the watch it remotely connects very briefly to the phone when attempting the call but then the phone automatically disconnects from remote dialling.
I would say that it is definitely software related, I also have tried all troubleshooting issues and more with no luck.

Hey there. Have you managed to get a fix for this?
I have been in contact with both o2 and Samaunf on this very issue and Samsung are saying to send it in for repairs. I am very dubious though that it is a hardware issue, rather software related.

Hi I have now got both a galaxy watch and a galaxy watch3 here in the UK to now work stand alone on a pay as you go ESIM and wondered if some of my findings may help.....
First the Galaxy Watch i bought second hand on an auction site
it had been on EE in the UK and when i first loaded an esim on it I could not make calls or connect to the network...
I looked under settings connections mobile networks only to find that there was no option to select 3g / 3g4g mode ....
Hence the unit was setup only to connect via 4g data ....by default ....and so would only send Voice calls over LTE ...and hence when i changed the ESIM from EE yo Vodafone I could not make calls or SMS ...and only had emergency calls over vodafone if i was in a 4g service area with no ability to search for or connect to 3g
So I downloaded OXX versions of the firmware instead of OXA for the UK ...and i got the earliest version i could find.
Then loaded it onto the watch ... then I checked the CSC and EE where using a non BTU CSC code so first...
I changed the CSC to BTU so I could support non EE ESIMs
Next I Uploaded an ESIM from Vodafone via Galaxy Wear on a samsung phone over a bluetooth link after first activating
the esim test feature of wear app to enable QT code scanning to load the ESIM.
The OXX firmware activated the 3g 3g-4g section option under settings connections mobile networks so i could enable 4g/3g auto selection .....then the watch could find and connect to 3g or 4g networks and make voice calls and send / recieve sms.
then I put the watch into firmware download mode to install OXA firmware ...and it was an the oldest version i could find
the watch rebooted and so i now had OXA firmware with the 3g-3g/4g toggle still present under settings.
checked it was on 3g-4g auto selection.
then I enabled Dexv mode and made sure the CSC was still on BTU for generic UK ....it wasnt it had changed so I reset it to BTU
then I upgraded the firmware to the latest version via wear app ...
So end up with a generic BTU UK CSC with the latest Firmware BUT with the 3g/4g selection option under mobile networks.
with another service providers ESIM installed 3g/4g to auto select and it all works fine.
hence myadvice is if you dont have 3g/4g then the watch may be locked to 4g ONLY and VOLTE as its only mode with the CDC set to something generic EE for example...
Hope this is of assistance as many conplain that the watch wont work stand alone for voice calls or sms properly
my days of time and many esim tests until i got 3g support and 3g-4g auto load lead mr to think that the watch is often
locked to 4g data and VOLTE only ....
I now have done this on watch and watch 3 models with full sucess stand alone pay as you go esims ....with the watch fully stand alone...working like a normal cell phone ....with esim service with a different provider to the sim in my samsung phone
comment please .... hope that helps

Hi. My problem is different from this. I can make and receive calls from My Active2 LTE and I can also send text messages. However, I cannot receive text messages. Basically I bought this watch to rely on this for calls and messages and this got totally disappointed me.
Any advise on how we can receive text messages?

I have had this problem too. The issue is in phone settings. Go to ADVANCED FEATURES and turn on ALLOW CALLS ON OTHER DEVICES also turn on mobile data in this setting.

Enable VoLTE Redmi Note 8T Stock MIUI 11 with TMobile USA

Purchased a Redmi Note 8T phone to replace my mother's aging LG feature phone, specifically due to TMobile USA dropping support for phones without VoLTE in January 2021. Followed the steps to disable the carrier check *#*#86583#*#* and confirmed that VoLTE option shows enabled on *#*#4636#*#* menu. Also confirmed I'm getting LTE signal and data. In the SIM settings it shows VoLTE enabled but no icon next to signal indicator and doesn't say HD when making calls. IMS status says Not Registered. Any suggestions? Is this because the phone has been on the TMobile network for only a couple hours? Or because TMobile still thinks she's using the LG feature phone which definitely wasn't VoLTE capable?

jwhite5840 said:
Purchased a Redmi Note 8T phone to replace my mother's aging LG feature phone, specifically due to TMobile USA dropping support for phones without VoLTE in January 2021. Followed the steps to disable the carrier check *#*#86583#*#* and confirmed that VoLTE option shows enabled on *#*#4636#*#* menu. Also confirmed I'm getting LTE signal and data. In the SIM settings it shows VoLTE enabled but no icon next to signal indicator and doesn't say HD when making calls. IMS status says Not Registered. Any suggestions? Is this because the phone has been on the TMobile network for only a couple hours? Or because TMobile still thinks she's using the LG feature phone which definitely wasn't VoLTE capable?
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After much testing and process of elimination we have basically determined that either it's not possible on the US T-Mobile network, or that getting it to work is far beyond my technical capabilities.

Question Problem to use Motorola Edge X30 in USA

Hello, first of all I want to say that my native language is Spanish and I am using the Google translator to write this, so there may be writing errors and apologize.
Buy a motorola edge x30 and the imported import from China. The phone is unlocked to be used with GSM networks from anywhere in the world. When I bought it, I was with Metro PCS but in Metro I was told that the phone was not compatible with the 3G networks of them. After that I started to investigate and find a web page called kimovil and there I saw that the edge x30 was compatible in the USA with all the networks of 3 suppliers: Cricket, AT & T and T-Mobile: I choose to use change to metro by T-Mobile.
Immediately I left the T-Mobile store after making the change I have tried and could receive and send SMS, receive and make calls, and get access to the Internet without any problem. After a couple of hours of having activated services with T-Mobile, the phone could not or receive more calls (the Internet and SMS continue to work normally, the problem is only with calls). When I try to call someone, the call is not done and says "Hanging Up". I tried everything: Factory Reset, Networks Reset, modify network configuration, everything ... and I can not solve the problem. I went to T-Mobile to tell you about my problem and they tell me that the problem is not them but my phone.
If anyone knows how to solve this problem, I would greatly appreciate the help because I feel frustrated. Thanks

I have MOTO EDGE x30 with T-Mobile. Work perfectly. Check the SIM setting.

[email protected] said:
I have MOTO EDGE x30 with T-Mobile. Work perfectly. Check the SIM setting.
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Good afternoon. I already managed to use the Edge X30 with the T-Mobile network. You just had to put the network selector on automatic so that you can use 5G, LTE, 3G and 2G as you see fit. The problem is that I realized that the phone only calls and receives calls in 3G and 2G, which limits not only the quality of the calls but also limits your coverage to be able to make calls since you can only make them in 3G and 2G . You who also use T-Mobile, does the same thing happen to you?

I'm not sure, but it supports 5G in N1/N3/N5/N7/N8/N20/N28/N38/N41/N78 and 4G in B1/B2/B3/B4/B5/B7/B8/B12/B17/B34/B38/B39/B40/B41. or check volte settings.

you may try to install "carrier services" app by google from the play store. it solves some of my problem with data connection.

jorgerios15 said:
Good afternoon. I already managed to use the Edge X30 with the T-Mobile network. You just had to put the network selector on automatic so that you can use 5G, LTE, 3G and 2G as you see fit. The problem is that I realized that the phone only calls and receives calls in 3G and 2G, which limits not only the quality of the calls but also limits your coverage to be able to make calls since you can only make them in 3G and 2G . You who also use T-Mobile, does the same thing happen to you?
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Yes I have the same issue. Whenever I make or receive voice calls, the phone falls back from LTE to 2G. I looked everywhere on the phone for 'VOLTE' settings but could not find it. Does VOLTE work for this phone on Tmobile? Very frustrating.

Has anyone been able to find the solution for the calls switching back to 2g? I love the phone but this is extremely annoying. I'm on T-mobile. Thank you