Database Users

Device keeps entering "Emergency Callback Mode" for no reason

I have an HTC Hero that keeps entering "Emergency Callback Mode" for what seems to be no reason at all. It mostly happens as soon as I answer an incoming call but also randomly in between.
This mode kills all data conenctions and prevents outgoing calls for 5:00. But, even if I say cancel, or wait the 5 minutes, it still stays on and I have to reset the device. It usually resolves itself after 45 mins or so. It happens once or twice a day.
I have researched the issue on google and I have found very little information about this problem. On some phones, this mode is enabled immediately after calling 911 to allow rescuers to call you back and locate you via GPS. I have never called 911 on this device.
I am currently running Cyanogen 7.1 RC2 ROM but I had the same issue on many different ROMS I tried so its not related to that.
on baseband 2.42.01.04.27. Maybe I should try downgrading it? How can I do that safely?
I really don't want to try reverting back to a stock ROM...
EDIT:
I think I posted this in the wrong forum, mod please move, sorry.

Hmmmm........so a complete doesn't solve the issue? And when you say ''sense'', does that mean with sense, it doesn't happen, but with the other Roms it does?

Try updating your radio to the latest .29
Yea its Me Again With the
Modified Hero

I just upgraded to the lastest baseband and it's still doing it.
I also figured out I can trigger the problem immediately by going to mobile network settings and changing my roaming preferences.
I should probably not that I recently repaired this phone and used QPST service programming tool to copy settings over from a touch pro 2 to the Hero. Could there maybe have been a wrong setting from the TP2 that is affecting the CDMA on this phone??

Just did a PRL update. No luck...

Did a succesful over-the-air profile and PRL update. Same problem...

ki1022 said:
Could there maybe have been a wrong setting from the TP2 that is affecting the CDMA on this phone??
Click to expand...
Click to collapse
Sounds like it. Is there no way to put everything back to default manufactured settings?

oohaylima said:
Sounds like it. Is there no way to put everything back to default manufactured settings?
Click to expand...
Click to collapse
I am considering using a stock RUU to completely wipe the phone to factory settings, but am trying to exhaust all my other options first so I won't have to re-root it and set everything up again... I'm almost at that point though.

ki1022 said:
I am considering using a stock RUU to completely wipe the phone to factory settings, but am trying to exhaust all my other options first so I won't have to re-root it and set everything up again... I'm almost at that point though.
Click to expand...
Click to collapse
!!!!!!!!!!!
FIXED IT SUCKAS.
Did a ##786# which reset all the CDMA settings, then re-did my NAM and data profile settings and it works. Go figure. Doing the ##786# on this phone also retained nearly everything including meid, baseband, recovery, and ROM. All it did was fix the problem. Awesome.
I still have no idea what was causing this to begin with, it was driving me crazy. Hopefully this thread will be helpful to someone else who has the issue.
On a side note, how dumb is this emergency mode?? So you call 911, then you can't call anyone else after that?? What if you need to call your wife and kids to say you love them one more time?! Haha.

Awesome!!!!!! Glad it's fixed. Now I'll just star this just in case it happens to me.

[Q] AIO Wireless on CM10.2

So I am running an interesting setup now where I am running a rooted and unlocked CM10.2 nightly with the GSM bit flipped and an AIO Wireless sim card. There are a few quirks that I have come across and trying to look for answers.
First:
I've had some difficulty getting my APN settings to save
Fixed using a build.prop change a few reboots.
Second:
I have an issue where my DTMF (touch tone) doesn't seem to be registering. Normally this wouldn't be a problem except for when I needed to call my insurance and they have an automated system. I don't know if this is a rom specific thing, an AIO Wireless specific thing or something else with the combination on my phone.
Third:
Since I've been running on GSM, the signal strength for my phone doesn't seem to be displaying properly. The phone works (and now I get internet), but the signal indicator doesn't seem to update. I use Lllama for some things and I see no new tower locations here either.
Fourth:
In Settings -> About phone -> Status -> My phone number is displaying as "Unknown." Not that big of a deal but I thought it was an interesting thing and wanted to see if it may be tied to any of the other issues I'm having.
If anyone has any insight on how to fix these things, that would be great appreciated and hopefully this can help any other people who may be having the same issues as me.

I'm using my Razr in GSM mode with CM10.2 on it. I'm in Italy, so maybe not everything I've done will work in other countries.
What did you changed to make the phone work in GSM mode? I just changed the following in the build.prop file (plus adding the APN):
"telephony.lteOnCdmaDevice=1" from 1 to 0
"telephony.rilV7NeedCDMALTEPhone=true" from true to false
"ro.telephony.gsm-routes-us-smsc=1" from 1 to 0
And everything works fine.
I've also tried to use the GSM fix found in this thread: http://forum.xda-developers.com/showthread.php?t=2446527, but is giving to me inconsistent results. Sometimes the phone works, sometimes drops the line, swithc from 3g to 2g, stops data download... So I flasher back a clean 10.2 ROM and added back only my previous changes.
By the way: in Settings -> About phone -> Status -> My phone number is displaying as "Unknown" too!

j27h said:
I'm using my Razr in GSM mode with CM10.2 on it. I'm in Italy, so maybe not everything I've done will work in other countries.
What did you changed to make the phone work in GSM mode? I just changed the following in the build.prop file (plus adding the APN):
"telephony.lteOnCdmaDevice=1" from 1 to 0
"telephony.rilV7NeedCDMALTEPhone=true" from true to false
"ro.telephony.gsm-routes-us-smsc=1" from 1 to 0
And everything works fine.
I've also tried to use the GSM fix found in this thread: http://forum.xda-developers.com/showthread.php?t=2446527, but is giving to me inconsistent results. Sometimes the phone works, sometimes drops the line, swithc from 3g to 2g, stops data download... So I flasher back a clean 10.2 ROM and added back only my previous changes.
By the way: in Settings -> About phone -> Status -> My phone number is displaying as "Unknown" too!
Click to expand...
Click to collapse
That totally worked! Now I have everything working properly. Thank you very much. Also, I figured out why in Status my phone number is unknown.
Open up the Phone app
Open the Settings menu
GSM call settings
Additional settings
Set your number in "My phone number"

Syphen5 said:
That totally worked! Now I have everything working properly. Thank you very much. Also, I figured out why in Status my phone number is unknown.
Open up the Phone app
Open the Settings menu
GSM call settings
Additional settings
Set your number in "My phone number"
Click to expand...
Click to collapse
Well... that's great: two solutions in two posts! Your phone is working and mine is displaing my number correctly... Hope these posts will be useful for someone else too!

j27h said:
I'm using my Razr in GSM mode with CM10.2 on it. I'm in Italy, so maybe not everything I've done will work in other countries.
What did you changed to make the phone work in GSM mode? I just changed the following in the build.prop file (plus adding the APN):
"telephony.lteOnCdmaDevice=1" from 1 to 0
"telephony.rilV7NeedCDMALTEPhone=true" from true to false
"ro.telephony.gsm-routes-us-smsc=1" from 1 to 0
And everything works fine.
I've also tried to use the GSM fix found in this thread: http://forum.xda-developers.com/showthread.php?t=2446527, but is giving to me inconsistent results. Sometimes the phone works, sometimes drops the line, swithc from 3g to 2g, stops data download... So I flasher back a clean 10.2 ROM and added back only my previous changes.
By the way: in Settings -> About phone -> Status -> My phone number is displaying as "Unknown" too!
Click to expand...
Click to collapse
Sorry for somewhat thread-hijacking, but you seem to know GSM stuff so I thought I'd ask, do you have any problems with making phone calls? I'm in the US on AT&T and when I make a call, if there is any noise coming in from the other person's microphone (either their voice or background noise),my voice starts breaking up on their end. I can hear them fine though.
I've tried several build.prop edits, such as changing persist.audio.handset.mic to 'analog' instead of 'digital', which makes my voice louder to others, but doesn't help with the audio breaking up. Do you know of any build.prop tweaks that might fix the issue? Thanks!

phantomsniper773 said:
Sorry for somewhat thread-hijacking, but you seem to know GSM stuff so I thought I'd ask, do you have any problems with making phone calls? I'm in the US on AT&T and when I make a call, if there is any noise coming in from the other person's microphone (either their voice or background noise),my voice starts breaking up on their end. I can hear them fine though.
I've tried several build.prop edits, such as changing persist.audio.handset.mic to 'analog' instead of 'digital', which makes my voice louder to others, but doesn't help with the audio breaking up. Do you know of any build.prop tweaks that might fix the issue? Thanks!
Click to expand...
Click to collapse
Hi Phantomsniper! Sorry for the late reply... to be honest I'm pretty new to the Android world (less than a year, coming from a Nokia 3310!). Maybe I've a similar issue: I can hear people fine (after cleaning the speaker), but on the other side they always say that my voice sounds too low (but not broken up for what I know). I'll try to investigate if my phone behaves as yours and if there's something we can do!

j27h said:
Hi Phantomsniper! Sorry for the late reply... to be honest I'm pretty new to the Android world (less than a year, coming from a Nokia 3310!). Maybe I've a similar issue: I can hear people fine (after cleaning the speaker), but on the other side they always say that my voice sounds too low (but not broken up for what I know). I'll try to investigate if my phone behaves as yours and if there's something we can do!
Click to expand...
Click to collapse
Yeah, that's pretty much it. Few things I noticed since my last post:
1) If I use headphones with a mic to talk, everything sounds perfect on both ends
2) When testing the bug, if I mute the other person's phone (so I can't hear what they say) then everything I say into the Razr M is clear on their phone
3) Speakerphone works fine
4) Sound problems occur with a T-Mobile SIM and perhaps a Verizon SIM too (I couldn't really test much with the VZW SIM because it was my friend's and she was in a rush so I just tried it for a minute)
I think basically, if any sound is coming through from the earpiece (the one that is right where the "MOTOROLA" logo is), then the microphone that is under the Verizon logo turns off or gets quiet or something. That would explain why speakerphone and using a headphone's mic works fine.
I don't want to get too off-topic here though. Perhaps we should talk over PMs if we find anything new.

[Q] Mobile internet don't start on Energy

Hello everyone. Firstly i'm sorry for my english.
I have last Energy ROM from this thread on CLK. Earlier sometimes i could not start mobile internet. (Letters E or H not show in statusbar), but i fix this restart HD2. Now it's not help. Airplane not help too. Something blocks this. In fact, now i can't use mobile internet in any way. I'm not changing operator and SIM-card. And i don't want change this ROM. Can anyone help me?

Is it just data or Wifi doesn't work too?

Marvlesz said:
Is it just data or Wifi doesn't work too?
Click to expand...
Click to collapse
Only mobile internet (I do not see the icon Edge or Hspda or 3G in statusbar)
Wi-fi, bluetooth, phone calls work fine.

alexfmos said:
Only mobile internet (I do not see the icon Edge or Hspda or 3G in statusbar)
Wi-fi, bluetooth, phone calls work fine.
Click to expand...
Click to collapse
Go and check the APN, make sure it is set up AND selected. If all is fine, turn on airplane mode, reboot device, turn off airplane mode then try connecting. Tell me what happens.

Marvlesz said:
Go and check the APN, make sure it is set up AND selected. If all is fine, turn on airplane mode, reboot device, turn off airplane mode then try connecting. Tell me what happens.
Click to expand...
Click to collapse
APN is fine and selected.
I do this before, but i do it right now again. Nothing has changed. Data not connected. One strange thing. After reboot airplane mode turns off automatically, i tried this twice. I do not know, may be is important.

alexfmos said:
APN is fine and selected.
I do this before, but i do it right now again. Nothing has changed. Data not connected. One strange thing. After reboot airplane mode turns off automatically, i tried this twice. I do not know, may be is important.
Click to expand...
Click to collapse
This might sound silly, but are you sure your data-package hasn't expired? I mean, try the sim card in another device, or call customer service. (If you're not sure).

Marvlesz said:
This might sound silly, but are you sure your data-package hasn't expired? I mean, try the sim card in another device, or call customer service. (If you're not sure).
Click to expand...
Click to collapse
I was absolutely sure of that, until you said it So i picked up my wife's phone (HTC Legeng) and switch our SIM. My SIM in Legend work fine. SIM wife in HTC HD2 also does not work (i mean data)

alexfmos said:
I was absolutely sure of that, until you said it So i picked up my wife's phone (HTC Legeng) and switch our SIM. My SIM in Legend work fine. SIM wife in HTC HD2 also does not work (i mean data)
Click to expand...
Click to collapse
That is weird.. Try reflashing your current Kernel, and make sure you select "PPP" connection if possible.

Marvlesz said:
That is weird.. Try reflashing your current Kernel, and make sure you select "PPP" connection if possible.
Click to expand...
Click to collapse
If I understand you correctly, I have to install ZIP v. 0.2.3 from this thread in CWM. I did it. Nothing has changed. I'm not understand about PPP. Wath exactly i need to do?
I suppose my options are ended :crying:

alexfmos said:
If I understand you correctly, I have to install ZIP v. 0.2.3 from this thread in CWM. I did it. Nothing has changed. I'm not understand about PPP. Wath exactly i need to do?
I suppose my options are ended :crying:
Click to expand...
Click to collapse
Yes, you understood correctly. But with that, I don't know what else might be the cause.
Let's go from the beginning: You said your data used to work fine, but one day it stopped. What happened in that day? Did you change something? Did you remove/change the sim? Did you install a certain app? Did you mess with a setting?
I wouldn't say your options have finished just yet.

Marvlesz said:
Yes, you understood correctly. But with that, I don't know what else might be the cause.
Let's go from the beginning: You said your data used to work fine, but one day it stopped. What happened in that day? Did you change something? Did you remove/change the sim? Did you install a certain app? Did you mess with a setting?
I wouldn't say your options have finished just yet.
Click to expand...
Click to collapse
Firstly i use mobile data very rarely (May be one times in a week) because most of the time i'm on work or home with Wi-Fi. But sometimes i really need it.
Data works fine, but not always. Sometimes this thing happened before, i mean data not started, and i fix this restart HD2 (it's sucks, but i could live with that). Then of course some apps was updated. I'm install few games (I tried uninstall them). And one day data not started again. I restarted HD2, but it's not help. Well, after many tries, i came here.
I'm not changing operator and SIM-card (and i'm not touch sim may be half year).
I suppose, i must install my ROM clean. Configure all settings & programms. It takes a lot of time, so I'll do it on the weekend. (I have a small five-month child , so it's a little difficult). May be it's help.
I hope there is a way to do without this, may be look some things in special programs, or adb shell or something like that, and find out what happens, what is stopping him.
That's it.

alexfmos said:
Firstly i use mobile data very rarely (May be one times in a week) because most of the time i'm on work or home with Wi-Fi. But sometimes i really need it.
Data works fine, but not always. Sometimes this thing happened before, i mean data not started, and i fix this restart HD2 (it's sucks, but i could live with that). Then of course some apps was updated. I'm install few games (I tried uninstall them). And one day data not started again. I restarted HD2, but it's not help. Well, after many tries, i came here.
I'm not changing operator and SIM-card (and i'm not touch sim may be half year).
I suppose, i must install my ROM clean. Configure all settings & programms. It takes a lot of time, so I'll do it on the weekend. (I have a small five-month child , so it's a little difficult). May be it's help.
I hope there is a way to do without this, may be look some things in special programs, or adb shell or something like that, and find out what happens, what is stopping him.
That's it.
Click to expand...
Click to collapse
Okay, I am sorry but I really don't know what the problem here is. Everything seems to me just fine. All I can recommend is going to MAGLDR because its data connections are stable (That is if cLK is actually the problem).
Other than that, I have nothing. Sorry.
I hope you get it fixed.

Well, If anyone is interested... I think i found "sticking point".
I backup my rom in cwm, and then started to experiment. (omg, i go to work sleepy). After uninstall all updates of "SuperSU" (and reset its settings) mobile data finally launched!!!
WTF was that? Don't know.

[Q] unfortunately, the process com.sec.ims.android has stopped

Hey guys, my wife has a stock Note 3 and every so often this prompt will pop up "unfortunately, the process com.sec.ims.android has stopped" If I hit ok, it will go away for about half a second and then pop up again. I can restart the phone sometimes or have to pull the battery and it won't happen again for about a week, but this is a problem that I need to resolve and I know someone in here has the know-how. I've looked all over the place on the internet, and on this forum but no one else has experienced the same thing, I'm puzzled. Please help, thank you.

gacn87 said:
Hey guys, my wife has a stock Note 3 and every so often this prompt will pop up "unfortunately, the process com.sec.ims.android has stopped" If I hit ok, it will go away for about half a second and then pop up again. I can restart the phone sometimes or have to pull the battery and it won't happen again for about a week, but this is a problem that I need to resolve and I know someone in here has the know-how. I've looked all over the place on the internet, and on this forum but no one else has experienced the same thing, I'm puzzled. Please help, thank you.
Click to expand...
Click to collapse
Go into settings>General>app manager>All> find contacts and open it then clear cache. If that doesnt help. Clear cache and data. Fixed it for me.

Galaxy Note 3
gacn87 said:
Hey guys, my wife has a stock Note 3 and every so often this prompt will pop up "unfortunately, the process com.sec.ims.android has stopped" If I hit ok, it will go away for about half a second and then pop up again. I can restart the phone sometimes or have to pull the battery and it won't happen again for about a week, but this is a problem that I need to resolve and I know someone in here has the know-how. I've looked all over the place on the internet, and on this forum but no one else has experienced the same thing, I'm puzzled. Please help, thank you.
Click to expand...
Click to collapse
hey there , wondering if you got your problem resolved , I have the same problem my phone start with that error today & even if I reset it , when I try to make a phone call come back up so I do manufacturer reset & still the same damn problem can anyone help me?

scooby2604 said:
hey there , wondering if you got your problem resolved , I have the same problem my phone start with that error today & even if I reset it , when I try to make a phone call come back up so I do manufacturer reset & still the same damn problem can anyone help me?
Click to expand...
Click to collapse
Same thing started happening to me on Friday 11/21/2014 morning.
I've tried:
Clearing cache and data in contacts.
Restarting the phone.
Reset the phone to factory default.
Wipe cache.
In some situations it will work for a call or two and then the same error message again.
Thank You

Hey, I keep having the same problem, but when I turn off my 4gLTE and just set it to just 4G not LTE the phone works fine, I can receive and make calls fine them when I turn on LTE I cant make or receive calls and my phone gives me the. unfortunately, the process com.sec.ims.android has stopped. Please try to see if this works for you, if it does it has to be the network.

this happens to my phone from time to time, but in my case, I only dismiss rhe pop up, and everything runs fine, I am also puzzled about this too

Same problem here, november 23 2014
I've done everything possaible....no answers??????? metro pcs...phone was a T-Mobile switched...Note 3
---------- Post added at 02:26 AM ---------- Previous post was at 02:15 AM ----------
sm0ke0ne said:
Hey, I keep having the same problem, but when I turn off my 4gLTE and just set it to just 4G not LTE the phone works fine, I can receive and make calls fine them when I turn on LTE I cant make or receive calls and my phone gives me the. unfortunately, the process com.sec.ims.android has stopped. Please try to see if this works for you, if it does it has to be the network.
Click to expand...
Click to collapse
ok this did work for me...but data will not work when im in this mode...network it is...im pretty upset2 days of dealing with this b.s....to metro pcs I go tomorrow...thanks for the help I will keep you updated

I have a t-mobile note3 switched to metro
I'm having the same problem . I tried what everyone was suggesting and nothing worked for me. I also tried Google and nothing. I Went To 2 Metro But Then Say It Was My phone. It seemed like they were not even trying to help me since the phone is tmobile. Everything works ok just the calls part. Some one help! It's frustrating

Has anyone been able to identity and or fix the issue? I'm also having the same problem phone works fine as far as everything I just cannot make or receive phone calls sometimes I never know when. I have it unlocked to use it with MetroPCS and it was working fine it just started one day. I have tried a brand new Sim card, factory reset, even disconnecting it and reactivate the phone...no luck. On WiFi calling it works perfectly so makes me think it's not the phone but make me wonder if it was the network why only us out of the millions of people...if anyone has any updated regarding this issue please get back with us. Thanks...

This worked for me!)))))
gunn714 said:
Has anyone been able to identity and or fix the issue? I'm also having the same problem phone works fine as far as everything I just cannot make or receive phone calls sometimes I never know when. I have it unlocked to use it with MetroPCS and it was working fine it just started one day. I have tried a brand new Sim card, factory reset, even disconnecting it and reactivate the phone...no luck. On WiFi calling it works perfectly so makes me think it's not the phone but make me wonder if it was the network why only us out of the millions of people...if anyone has any updated regarding this issue please get back with us. Thanks...
Click to expand...
Click to collapse
Go to settings...then calls...press that VOLTE then just turn it off. I've been weeks with my phone and finally this worked for me. I went through the same thing everyone else did..it sacked but now my phone working great hope it works out for u

lala4 said:
Go to settings...then calls...press that VOLTE then just turn it off. I've been weeks with my phone and finally this worked for me. I went through the same thing everyone else did..it sacked but now my phone working great hope it works out for u
Click to expand...
Click to collapse
@lala4 ...thanks i did just like u said and so far it has been working great for me no issues anymore..u are a lifesaver

Dizy801 said:
Go into settings>General>app manager>All> find contacts and open it then clear cache. If that doesnt help. Clear cache and data. Fixed it for me.
Click to expand...
Click to collapse
yea i am curently experiencing the same problem

I tried the same thing and it works as long as i dont restart the phoen. Then it starts all over again. Very frustrating. Does anyone know if what this process does or if you can disable or uninstall this? Maybe thathat would work, as long as it is not something you really need ofcourse. Thanks.

You can try the same thing using titanium back up. that helps sometimes. Just open Titanium backup. locate ur contacts and phone apk. click them and then click clear data. i havnt tried this method but its worth a try. maybe the next time i experience it i will try this as well.

Dizy801 said:
You can try the same thing using titanium back up. that helps sometimes. Just open Titanium backup. locate ur contacts and phone apk. click them and then click clear data. i havnt tried this method but its worth a try. maybe the next time i experience it i will try this as well.
Click to expand...
Click to collapse
I tried doing that already and same message appears when i restart phone. I was thinking of freezing the com.sec. Ims.android and all ims related using titanium, but wanted to see if anyone knows what these processes are used for.

Question??
lala4 said:
Go to settings...then calls...press that VOLTE then just turn it off. I've been weeks with my phone and finally this worked for me. I went through the same thing everyone else did..it sacked but now my phone working great hope it works out for u
Click to expand...
Click to collapse
What is "VOLTE"????

I had the same problem and i went to the app manager>all and there I found the process that always crashes (com.sec.ims.service) and I forced to stop, and it's seems to have solved the problem by now

Re-Enable 4G through phone codes

Hey all,
About a year ago I was working in an area with almost no 4G and my galaxy note 3 kept chewing battery so I disabled it using a phone code (I can remember which one but it was *#somethingsomething#).
Now I cant seem to find the code again.. I've tried the *#*#4636#*#* and nothing happens. I cant seem to enable it in the settings menu either. I also tried a factory reset and it didn't fix it.
BTW I live in AUstralia and have a Telstra provided phone.
Any help would be greatly appreciated!
THanks
Sam

Search the furom for LTE Enabler.

ftosam said:
Hey all,
About a year ago I was working in an area with almost no 4G and my galaxy note 3 kept chewing battery so I disabled it using a phone code (I can remember which one but it was *#somethingsomething#).
Now I cant seem to find the code again.. I've tried the *#*#4636#*#* and nothing happens. I cant seem to enable it in the settings menu either. I also tried a factory reset and it didn't fix it.
BTW I live in AUstralia and have a Telstra provided phone.
Any help would be greatly appreciated!
THanks
Sam
Click to expand...
Click to collapse
To do easier method , just install "Phone Info" app from play store.
There is an option to explore secret codes and there scroll down and u will see 4636. Click that one with launch0. and Bingoo!!

Thanks! That App is awesome!
While the code didn't take me where I hoped, I went into ServiceMode. And bingo! that's the menu I was in earlier.
I remember I went ServiceMode>LTE>LTE RF>VZW LTE B4 on/off > Disable....
However I changed it back to enable ages ago and it still wont work!
Although my memory is pretty bad, so I may have changed something else at the time, but this is definitely the right menu....
Any help? Thanks again

ftosam said:
Thanks! That App is awesome!
While the code didn't take me where I hoped, I went into ServiceMode. And bingo! that's the menu I was in earlier.
I remember I went ServiceMode>LTE>LTE RF>VZW LTE B4 on/off > Disable....
However I changed it back to enable ages ago and it still wont work!
Although my memory is pretty bad, so I may have changed something else at the time, but this is definitely the right menu....
Any help? Thanks again
Click to expand...
Click to collapse
You want to use 4G(LTE) on your device right? let me help you find the problem. I found this somewhere in this forum previously.

Yes that's exactly what i'm after. but I cant find where to re-enable it. the service menu seems to be a good start tho

Did you also enable it in settings > More Networks > Mobile Networks > Network mode?

Yeah I have. I've got LTE/WCDMA/GSM (Auto-Connect) selected there

If you are not rooted try the following: