Database Users

[Q] Cant make and receive call when roaming on gsm

hey all
i've got a problem with my droid pro in eu on gsm/umts network.
when i'm roaming and use gsm only (no umts) my mic and speaker are dead. i can make a call and receive it, but i cant hear anything and caller doesnt hear me. display shows seconds have past so line is opened. i can even receive sms and mms just fine and send them, only cals dont work.
if i change from gsm to umts only, then calls work fine. when im on home network everything is ok.
funny thing is, that if i make a call on roaming in umts only and then change to gsm only i can receive first call, then it's all blank again.
i have stock rom
tnx
teva

probably the problem was with the network where you was located. did you tried another network?
my droid pro works nice in roaming, in both gsm and umts.

I am facing a similar issue.
2G 900/1800 Mhz -- Voice & Data Work fine.
3G 1900 Mhz --- No Voice, Phone re-boots. Data works.
So I have to use the phone in GSM only mode.
I am on 2.3.3 / Verizon 4.6.4 update.

My new operator have same issue! (no with the old operator!!)
In a specific location i can't make/receive a call in only 2g (i can send/receive sms and data traffic is ok)... But if I switch in 3g i can do everything...
For my operator it is an issue between sim (by ORGA) and droid pro and so I'll replace my sim...

I didn't find non ORGA sim, but i have bought a dualsim adaptor, for seeing... Nothing...!
On my operator (TIM), when i'm on edge in only same locations, i can't make/recivie calls... Not with my ex operator (wind)..
But... you can try to compose on your dialer ##7764726 then call, then password 000000
verify
06 test mode
next
next
service option switch to 13k, or others, then back...
Make a call, or try this configuration
if you restart your phone you must reselect this...
Tomorrow i'll try...

Cannot receive calls on T-Mobile.

I can call out but ppl can't call me. Do not disturb isn't on. Anyone had similar issue?
So, it's an LTE issue. I can get incoming call when I force 3G connection but when I am on LTE band 4, no incoming call.
I also don't have enhance LTE options under cellular network settings.
I sideloaded the band 12 enabler from this thread. http://forum.xda-developers.com/mot...nable-band-12-moto-pure-mm-ota-t3267057/page7

I am having the same issue.. I have to force 3G in order to receive calls! Hopefully someone can help us!

935p unlocked and flashed to 935u but can't pick up cdma bands

So maybe this was a bad idea but I'm on boom mobile (verizon mvno) and thought I could save some money and picked up a sprint s7 edge on sale, I just had it unlocked and they flashed it to the 935u unlocked version. The problem is I can't connect to the verizon network, after playing around with it a bit I got it to connect to the verizon lte network but still no voice. In my meager attempts to troubleshoot I noticed I have the options under network mode of
LTE/3g/2g -->> this picks up all networks in my area (Verizon, Sprint, ATT, Tmobile, US Cellular)
3g/2g --> only shows ATT and Tmobile
3g --> only shows ATT and Tmobile
2g --> only Tmobile
So I'm thinking my phone isn't setup right to connect to cdma networks which I thought the 935u rom was supposed to do. Anyone have any tips on how i can further troubleshoot this?
Thanks in advance.
edit: Well I installed a program called 4g LTE switch and set it to cdma only and I was able to make a phone call (3g data also worked) like that but changing it to LTE/cdma wouldn't let me make a call but LTE data worked, if i leave it set to LTE/cdma and reboot it switches back to LTE only.
edit2: Maybe it's trying to connect to volte which isn't offered for Verizon MVNO's yet but i don't see any settings available to disable that.
edit3: When set to LTE/CDMA I could sometimes make outgoing calls, sometimes I would get the double dial prompt, it was very slow to switch between LTE and CDMA so I would miss incoming phone calls.
I threw in the towel and just flashed the latest Verizon rom and it's working properly.

Incoming/ Outgoing call problem while on 4G network with no volte support.

I have recently bought the MI A1. While buying itself it was updated to the latest may patch.
The problem is while on 4g network, I cannot receive nor make any phone calls. For calling I have to manually switch to 3g/2g mode from *#*#4636#*#* menu. Is this a normal behavior of this phone as my other phone swiches to 3g while incoming/ outgoing calls and back switches to 4g after the call is finished.
PS: my network doesn't support volte. Phone is manufactured on Feb 2018, it's not modified by any means.

That's not normal behavior.
I've never seen a phone where You have to switch between 3G/4G/LTE for calls and data.
Can You try a SIM-card from another service provider to see if it behaves differently?
If You check at https://willmyphonework.net/ are all bands supported with Your provider?
Or, in worst case of course, try a factory reset and see if that makes any difference...

Set to 3g/4g in *#*#4636#*#* menu.
Airtel doesn't support volte in all circles yet. Only rolled in few circles. In 3g/4g mode, it'll be mostly in 4g mode if nw strength is good & switch to 3g when you call or receive a call

Second Galaxy S10+ dropping signal when phone is locked for 2+ min

I bought a brand new factory unlocked Galaxy S10+. I popped in my Tmobile sim card but my calls goes to voice mail and I can't make any calls in following conditions.
I also tried Verizon sim and it acts the same way so not sure if network is the culprit.
1) When the wifi is on, my phone identifies network as I see 'Tmobile' in screen, signal strength is '-113 dBm 0 asu' but no actual incoming/outgoing call.
2) When the wifi is off, but screen is locked for 3-4 min, I still see 'T-mobile' but no incoming/outgoing call. Also, the service state changes 'In service' to 'Out of service' intermittently where I have to toggle aeroplane mode.
So, I have to toggle aeroplane mode on/off to get the network back while wifi is off, signal strength is '-81 dBm 59 asu' then everything works normally until I lock the screen as in step 2 or use wifi as in step 1.
This is my second replacement phone and it is behaving the same way as the first one. So, I am not sure if I am having bad luck with Samsung phones or if something is funky with my network. I also have a S9+ which has no issues at all with same sim cards and network coverage is excellent in my area.
Any idea or suggestion would be really helpful. Not sure if I should just change the firmware from U1 to Tmobile or something.

I would check your APN settings to verify that they are correct. I am on T-Mobile network with U1 firmware and have no issues with calls (I'm on MintSim which uses the T-Mobile network) but when I popped in my SIM no T-Mobile APN settings autopopulated--I had to enter the APN settings manually.
You should also make sure Volte is enabled in the network settings and WiFi Calling is enabled in the dialer settings.

jhs39 said:
I would check your APN settings to verify that they are correct. I am on T-Mobile network with U1 firmware and have no issues with calls (I'm on MintSim which uses the T-Mobile network) but when I popped in my SIM no T-Mobile APN settings autopopulated--I had to enter the APN settings manually.
You should also make sure Volte is enabled in the network settings and WiFi Calling is enabled in the dialer settings.
Click to expand...
Click to collapse
Thank you for your response. My T-mobile APN settings auto populated and looks fine as I have LTE connection. The issue is that the connections keeps dropping and all my calls goes to voicemail in above two scenarios.
If the LTE didn't work at all or if my calls went to voicemail all the time, I would understand that some settings are not setup properly. But it works intermittently. Since, this is the second Galaxy S10+ with same exact issue, I am not sure if there is a issue with device or carrier.