Database Develop

HTC One M7 cannot make/receive phone calls while in LTE mode

Hello, I just purchased an unlocked HTC One M7 to use on Rogers. LTE works 100%, HSPA works 100%, 3G works 100% (meaning I can use the data flawlessly). HOWEVER, I cannot make or receive any phone calls if I am in GSM/HSPA/LTE mode.
When I call my phone while in LTE mode, I can see my phone switching from LTE to HSPA/3G immediately (that's supposed to happen since calls cannot be made over LTE atm) but the phone does not ring at all.
IF I put my phone in GSM/HSPA mode, then incoming/outgoing calls work flawlessly... if I switch back to LTE mode I can't make/receive phone calls anymore. I know for sure it's the LTE mode cuz I tried 4-5 times switching back and forth between GSM/HSPA/LTE to GSM/HSPA only mode and phone calls ALWAYS work under GSM/HSPA and RARELY work under GSM/HSPA/LTE (a couple times it did go through but 95% of the time it doesn't work).
I tried flashing a new modem, a new ROM and everything but it's still the same problem.
Does anyone have any suggestions? Thanks!
EDIT - Just noticed that calls stop working in 3G mode too until I restart the phone
EDIT 2: Alright, from going through *#*#4636#*#* I've isolated it down to HSPA+. Phone calls ONLY work on HSPA+ and not when it's on 3G or LTE. Any ideas?

Flash a full ruu ?

My phone does this as well. but i dont have any problems getting calls or sending calls. If using LTE it drops to 3G while on the call. Though my phone is screwed and i never get HSPA+. Really wish there were more Bell users around.

I experimented all day yesterday with several different roms, downgrading down to JB back up to KitKat, tried a few different modems but still nothing calls ONLY work on HSPA.. u think it's a defective radio or something? my phones not under warranty either is there a way to get it fixed

i think its the firmware not matching up with radio. or having the wrong radio all together. I cant get S-off so its made it a pain in my ass. Ive pretty much given up hope lol. I could take my phone back to sense 5.5 stock with a nandroid that i have and everything works normal but i like sense 6 so ive just learned to deal.
if i could get any of the latest Bell or Telus radios it may be a help.

Howie3045 said:
i think its the firmware not matching up with radio. or having the wrong radio all together. I cant get S-off so its made it a pain in my ass. Ive pretty much given up hope lol. I could take my phone back to sense 5.5 stock with a nandroid that i have and everything works normal but i like sense 6 so ive just learned to deal.
if i could get any of the latest Bell or Telus radios it may be a help.
Click to expand...
Click to collapse
With your issue, phone dropping to 3G while on call it is normal because right now there is no voice over LTE. So the phone has to drop down to the either HSPA or 3G, whichever one is available.
and yeah you might be right about not having the right modem, but I can't find a Rogers modem ANYWHERE. The only one I found was part of a RUU to get back to stock if anyone has even an oldd Rogers HTC One M7 radio, please please please post a TWRP/CWM flashable version of the modem lol

No data or voice, shows ! in icon

This last week at work I started noticing that my data and voice would drop off and I would get the icon showing half signal but would have an ! In the icon. When I look at the Sim status it shows I'm connected but I'm not. After rebooting the phone I will have 4G service for about 20 minutes then it drops off again.
I have Tmo and contacted support and they told me to reset the APN but that didn't help.
The only thing that looks new on my phone is a recent app called Google Connectivity Service.
Other people at work on Tmo are not experiencing this issue but they are on Kit Kat still. I don't have this issue at home, I get full LTE there.
EDIT:
This is still broken as of 05/20/2015 -- Possible workarounds can be found here (thanks TaintedByte).

I have this same issue but it's only at home. I think it's just due to poor service when I'm in my house or I have to many towers to connect to..... It switches from no data to E,3g,H,H+ constantly while I'm just sitting on the couch. But I also get ! Frequently

I would think it was poor reception but this a recent thing for me. Before this week I haven't had this issue and others in my office have full 4G signals.

OMG. I have the EXACT same problem. I just switched to TMobile and got the nexus 6 on the 13th. Everything was "fine" at my work. I'd be stuck on 3G most of the time, but it never failed me. Then starting this week, it's been dropping signal like crazy, getting the !. It's defintely due to a weak signal, but I don't know why it was fine for 3 weeks, and then all of a sudden started having problems.

+1 - on Spring Rom
EDIT - Went back to a backup of Bliss, problem has not appeared.

I was trying to fix it by forcing it to 3G, but my phone likes to try to switch to HSPA when I set it to 3G and that one is pretty weak too. If there was a way to force it to 3g without hspa, I think i'd be fine. I just tried forcing it to 2G and I get a pretty strong EDGE signal. It'll be slow as balls, but I'll see if that fixes it. Unfortunately the area I live in isn't going to get band 12 for quite a while, if ever. It's one of those major cities that have an exception on it for a TV station that still exists.

rbox said:
I was trying to fix it by forcing it to 3G, but my phone likes to try to switch to HSPA when I set it to 3G and that one is pretty weak too. If there was a way to force it to 3g without hspa, I think i'd be fine. I just tried forcing it to 2G and I get a pretty strong EDGE signal. It'll be slow as balls, but I'll see if that fixes it. Unfortunately the area I live in isn't going to get band 12 for quite a while, if ever. It's one of those major cities that have an exception on it for a TV station that still exists.
Click to expand...
Click to collapse
3G is HSPA/+. On Tmo anyway. When in 3G mode it will display 3G (also known as UMTS) when data is idle and will display HSPA or HSPA+ when data is active.

jbdan said:
3G is HSPA/+. On Tmo anyway. When in 3G mode it will display 3G (also known as UMTS) when data is idle and will display HSPA or HSPA+ when data is active.
Click to expand...
Click to collapse
Well that's weird, because sometimes I'll see 3G shown while data is active and I see differnet levels for 3G vs H on the icon. But it looks like I have a pretty strong H right now. Maybe I'll have good luck this afternoon.
---------- Post added at 01:40 PM ---------- Previous post was at 01:32 PM ----------
I take it back. Sometimes the icon will get "stuck" and show a great signal but no connection.

Have you guys tried turning off enhanced LTE in carrier settings?

Evolution_Freak said:
Have you guys tried turning off enhanced LTE in carrier settings?
Click to expand...
Click to collapse
I just did. And eventually it died. It seems like if I leave it on the preference of LTE, then I get the exclamation point. If I force it to be 3g only, then I get the situation where the icon claims it's 3G, and the signal looks good, but I have no service.

midwestkel said:
This last week at work I started noticing that my data and voice would drop off and I would get the icon showing half signal but would have an ! In the icon. When I look at the Sim status it shows I'm connected but I'm not. After rebooting the phone I will have 4G service for about 20 minutes then it drops off again.
I have Tmo and contacted support and they told me to reset the APN but that didn't help.
The only thing that looks new on my phone is a recent app called Google Connectivity Service.
Other people at work on Tmo are not experiencing this issue but they are on Kit Kat still. I don't have this issue at home, I get full LTE there.
Click to expand...
Click to collapse
I have the same problem with sprint, they couldn't give me a solution either...

mnsportsguy1978 said:
I have the same problem with sprint, they couldn't give me a solution either...
Click to expand...
Click to collapse
Did it just start, or have you been having it for a while? Has anyone tried using the radio image from 5.0?

rbox said:
Did it just start, or have you been having it for a while? Has anyone tried using the radio image from 5.0?
Click to expand...
Click to collapse
Just since 5.1 I believe, at least didn't notice it before...

Been having signal issues as well lately (T-Mobile) and now that I think of it it's very closely timed to when that Google Connectivity app showed up! Just disabled it to see if I notice a difference

YankInDaSouth said:
Been having signal issues as well lately (T-Mobile) and now that I think of it it's very closely timed to when that Google Connectivity app showed up! Just disabled it to see if I notice a difference
Click to expand...
Click to collapse
I've disable mine and so far so good... but who knows. What version do you have? I see I have A.1.0.1, but on the play store I see an update for B.1.3.3. It doens't show up in my list of apps to update, but if I do a direct search, it shows up as an update.
---------- Post added at 04:59 PM ---------- Previous post was at 04:56 PM ----------
Of course I had to just go and jinx it. It just got the problem again. But I did also reenable the app for a short while before disabling it again. Maybe it's related...

rbox said:
I've disable mine and so far so good... but who knows. What version do you have? I see I have A.1.0.1, but on the play store I see an update for B.1.3.3. It doens't show up in my list of apps to update, but if I do a direct search, it shows up as an update.
---------- Post added at 04:59 PM ---------- Previous post was at 04:56 PM ----------
Of course I had to just go and jinx it. It just got the problem again. But I did also reenable the app for a short while before disabling it again. Maybe it's related...
Click to expand...
Click to collapse
Not sure if the version I was running assume that it was the latest, but it uninstalls updates before disabling ...

Seems like the affected users are on T-Mo. Have you gents considered tower maintenance/upgrades?
I'm on T-Mo as well. I've had a few similar instances over the last few months, but the problem resolves in the areas it's happened, and now the reception is better.

TheAmazingDave said:
Seems like the affected users are on T-Mo. Have you gents considered tower maintenance/upgrades?
I'm on T-Mo as well. I've had a few similar instances over the last few months, but the problem resolves in the areas it's happened, and now the reception is better.
Click to expand...
Click to collapse
For a whole week? It's defintely a signal strength issue, I just can't figure out why. The way the building I work in is laid out, there is a hallway along the edge, and I get great LTE there. then I walk into the room a few feet away from the window, and it's fine. Then I go behind my cube wall, and it starts to get weaker. Than as I move a few feet away from the wall, it drops to 3G.
Also, it looks like disabling Google Connectivity Services didn't do it for me. I had rebooted with it disabled and evenutally it still died.

rbox said:
Well that's weird, because sometimes I'll see 3G shown while data is active and I see differnet levels for 3G vs H on the icon. But it looks like I have a pretty strong H right now. Maybe I'll have good luck this afternoon.
---------- Post added at 01:40 PM ---------- Previous post was at 01:32 PM ----------
I take it back. Sometimes the icon will get "stuck" and show a great signal but no connection.
Click to expand...
Click to collapse
Very odd. I've been having some weak LTE signal issues at home, but only at home. Wife's S6 stays connected to LTE -110dbm here while my N6 hunts and switches back and forth between 3G and LTE. Started happening about 2-3 weeks ago. I've been hoping it's T-Mobile, not my phone

rbox said:
I take it back. Sometimes the icon will get "stuck" and show a great signal but no connection.
Click to expand...
Click to collapse
I've had that happen as well.
Evolution_Freak said:
Have you guys tried turning off enhanced LTE in carrier settings?
Click to expand...
Click to collapse
Tried that and it didn't do anything for me.
rbox said:
Did it just start, or have you been having it for a while? Has anyone tried using the radio image from 5.0?
Click to expand...
Click to collapse
It just started this week for me. I've had 5.1 for over a month and haven't had this issue before Monday.
I've tried disabling the Google Connectivity Services (v B.1.3.3) app and that did nothing for me as well. I also switch my APN to IPv4/IPv6, it was on IPv6 only but it didn't make a difference. I also did a test by taking the phone to a location that I know has strong LTE while it have the ! icon and it would not reconnect to any network. I tried toggling airplane mode but it didn't refresh the cell/data radio either. After rebooting I had full LTE service.
I talked to Tmo reps and they didn't see any maintenance on the towers in my area but they opened a ticket for me.
It seems like something is bugging out while it jumps between LTE/4G/3G and then the radio crashes. At home it's solid LTE and I don't have any issues.

Can't make calls on VZW after switching back from Fi

I decided to give Project Fi a try after the word came down about Verizon raising the rates for unlimited data plans. Long story short, it's not for me. The coverage stinks in the areas I travel. Battery life took a big hit due to it having trouble finding and keeping a signal. I thought it would be better having looked at the TMo coverage maps. Anyway, that's a different topic.
I hadn't canceled my Verizon account so I put that SIM back in and it seems like I am connected to Verizon's network again. All the texts sent to that number came through once the phone was turned on with the VZW SIM back in. However, I can't make any calls. I get an operator error about being unable to complete the call. The Cellular Network Settings only has a roaming setting. Don't have the Enhanced VoLTE option and the other things I had prior to switching to Fi. Did the *#*#4636#*#* thing to try turning the radio off and on, turning on the VoLTE provisioning flag, rebooted, etc. No change in my ability to make calls. Anyone have any ideas what I need to do to get voice calls working again? If it matters, I am on 5.1.1 LMY48T.

HankStorm said:
I decided to give Project Fi a try after the word came down about Verizon raising the rates for unlimited data plans. Long story short, it's not for me. The coverage stinks in the areas I travel. Battery life took a big hit due to it having trouble finding and keeping a signal. I thought it would be better having looked at the TMo coverage maps. Anyway, that's a different topic.
I hadn't canceled my Verizon account so I put that SIM back in and it seems like I am connected to Verizon's network again. All the texts sent to that number came through once the phone was turned on with the VZW SIM back in. However, I can't make any calls. I get an operator error about being unable to complete the call. The Cellular Network Settings only has a roaming setting. Don't have the Enhanced VoLTE option and the other things I had prior to switching to Fi. Did the *#*#4636#*#* thing to try turning the radio off and on, turning on the VoLTE provisioning flag, rebooted, etc. No change in my ability to make calls. Anyone have any ideas what I need to do to get voice calls working again? If it matters, I am on 5.1.1 LMY48T.
Click to expand...
Click to collapse
The solution is to go into the calls section of the dialer and disable the call assistant settings.
https://www.reddit.com/r/ProjectFi/...ing_between_verizon_and_project_fi_sim_cards/

OK, so I can make calls again by changing the setting above. But I am without simultaneous voice and data. Still missing most settings under Cellular Network. Any ideas on how to get that back? Is there anything I need to toggle in the *#*#4636#*#* menu?

I'm having the same problem. But the issue is my phone is operating In Ireland, I've never lived in the u.s but I don't have call assistant in my dialer settings...I have data and texts and can receive calls but can't dial out, I obviously don't have access to projectfi here in Ireland and it is installed on my phone but its disabled and always has been, really strange I flashed the ROM for marshmallow automatically suggested by NRT for my device, but I'm wondering if the rom I flashed was u.s. specific even though it didn't suggest that in the rom I flashed...it has me absolutely baffled.

HankStorm said:
I hadn't canceled my Verizon account so I put that SIM back in and it seems like I am connected to Verizon's network again. All the texts sent to that number came through once the phone was turned on with the VZW SIM back in. However, I can't make any calls. I get an operator error about being unable to complete the call. The Cellular Network Settings only has a roaming setting. Don't have the Enhanced VoLTE option and the other things I had prior to switching to Fi. Did the *#*#4636#*#* thing to try turning the radio off and on, turning on the VoLTE provisioning flag, rebooted, etc. No change in my ability to make calls. Anyone have any ideas what I need to do to get voice calls working again? If it matters, I am on 5.1.1 LMY48T.
Click to expand...
Click to collapse
This came up alot when the N6 was first released last year. You will need to factory wipe the phone, and then you will have full access to the Verizon network. There is an issue with putting in a Verizon SIM after using another carrier's SIM.. Not sure but it might have affected Sprint also. The posts are out there on XDA about this, if you dont trust me. You can search and find them.

http://forum.xda-developers.com/showpost.php?p=63403127&postcount=22
---------- Post added at 06:01 PM ---------- Previous post was at 05:55 PM ----------
HankStorm said:
OK, so I can make calls again by changing the setting above. But I am without simultaneous voice and data. Still missing most settings under Cellular Network. Any ideas on how to get that back? Is there anything I need to toggle in the *#*#4636#*#* menu?
Click to expand...
Click to collapse
make sure that your apn is correct.. if not fix it.

PaisanNYC said:
This came up alot when the N6 was first released last year. You will need to factory wipe the phone, and then you will have full access to the Verizon network. There is an issue with putting in a Verizon SIM after using another carrier's SIM.. Not sure but it might have affected Sprint also. The posts are out there on XDA about this, if you dont trust me. You can search and find them.
Click to expand...
Click to collapse
Sorry for the late reply. Life got in the way of me checking back on this thread sooner.
I believe you about the factory reset fixing it. Was just hoping there was an easier way so I don't have to setup my phone again. Perhaps the Marshmallow OTA will fix it but who knows when we'll get that. I'm tired of dealing with the signal issues I have as a result of switching back and forth so I'm going to do the reset. Just to confirm, this is the option under Settings > Backup & reset, right? Or is it something I need to boot into recovery to do?

Nexus 6 on Sprint- Unable to use 3G, only LTE or 1x

I have a Nexus 6 activated on Sprint. My phone will only connect to either LTE or 1x. Any time it would normally connect to 3G, it will first show signal bars with no data icon. In LTE discovery I will have bars of eHRPD but it never actually establishes a 3G connection. Then after a few minutes of that it just drops down to 1x and stays there.
I have tried: flashing complete factory MRA58N, *#*#72786#*#* , update PRL, update profile, new SIM card and nothing fixes it. I think it's an issue on Sprint's end and not the phone but is there anything else I can try?

I ported my number to Project Fi, then decided to port back to Sprint to see if a new activation would help... but it didn't.
Any input?

how did you activate the phone? sprint isnt a "pop in a sim and you're good" carrier, you have to activate the sim AND the phone's radio for everything to work. go to a store if you cant figure it out with sprint over the phone
---------- Post added at 02:29 PM ---------- Previous post was at 02:24 PM ----------
you also have to have the right model phone, if you have XT1103 you're good, but any other model wont work.

Cell signal keeps reverting to 3G

Hi,
So I'm having an issue keeping an LTE signal. I use straight talk with at&t and I can get LTE if I turn the radio on/off, but it will always switch itself over to 3G at some point in the same location. There are apps that can force it to do LTE only which works, but I can't make or receive voice calls over LTE.
Does anyone know how to fix this? This never happened on other phones on the same network. In my specific location I get 2-3 bars of LTE and 4 bars if switched to 3G. I guess it wants to keep using the better signal.

Also at home where I have full signal LTE and H+, it will choose H+ over LTE.

Had same problem. Switched sim slot to the other. 4g again. Try IT?

Did you try different APN settings? I'm guessing you already checked the preferred network option.
Sent from my MIX using Tapatalk

APN settings are good and I can get LTE if I flip the radio on and off...it just always wants to revert back to 3G at some point. Same thing happens in sim card slot 1 or 2

pacattack81 said:
Hi,
So I'm having an issue keeping an LTE signal. I use straight talk with at&t and I can get LTE if I turn the radio on/off, but it will always switch itself over to 3G at some point in the same location. There are apps that can force it to do LTE only which works, but I can't make or receive voice calls over LTE.
Does anyone know how to fix this? This never happened on other phones on the same network. In my specific location I get 2-3 bars of LTE and 4 bars if switched to 3G. I guess it wants to keep using the better signal.
Click to expand...
Click to collapse
Which rom are you on? I remember there's a specific rom that has a bad modem file. Trying updating to the latest version.

Maybe you can solve it by going to APN settings and set APN protocol -> IPv4 and APN roaming protocol -> IPv4 . That worked for me. I had the same issue.
Or try IPv4/IPv6. That's network related and maybe IPv4/IPv6 is correct for you.
I have to set it every time I flash EU or EPIC rom.
Good luck.

did you ever figure this out?
I'm having a similar problem on a Note 4 Global. Only it switches to 3G for a voice call and never switches back.

dennygreen said:
did you ever figure this out?
I'm having a similar problem on a Note 4 Global. Only it switches to 3G for a voice call and never switches back.
Click to expand...
Click to collapse
Firmware update?

james1089 said:
Firmware update?
Click to expand...
Click to collapse
I've updated it, and it's all the same. Once in a great while it will switch over to LTE on its own, but 99% of the time it will just sit on H+ forever even though I know the LTE is fine wherever I go.
I guess this is just how it's going to be.

I finally fixed this by wiping everything in twrp and flashing a newer version of the global stable rom. LTE works fine now, and it doesn't stick on H+ when I make a call anymore.

dennygreen said:
I finally fixed this by wiping everything in twrp and flashing a newer version of the global stable rom. LTE works fine now, and it doesn't stick on H+ when I make a call anymore.
Click to expand...
Click to collapse
That's interesting. I guess Xiaomi fixed the bug in one of the releases. I wonder why you had to wipe everything though. What if we try to flash the latest modem. Is there a link to that? Would that work?

Would modem be the same as firmware? There's a thread on here that has those. None of them did anything for me.
My LTE problem is isn't fixed after all I guess. Once it loses LTE, it still never reconnects to it on its own and goes to H/H+ forever.
I guess the only thing that I've fixed is that it actually switches back to LTE after a phone call.