Phone drop call...

[tchan]

Hi,
My pixel 3a drop the call after 3 or 4 rings or after 8 secondes maximum in a conversation.
Everything else works, MMS, internet...

I started with the right android version and the installation works perfectly with the installer.

I revert back to Android stock ROM to check and it's exactly the same.

I have the feeling that I mess up with the first downgrade to android 9 cause I tried with TWRP and made something wrong ( maybe with slot A/B ) and the phone didn't start at all, I finally done it very easily with Android flash tool through Chrome.
Now the installation of Ubuntu touch (with installer) and the android 9 works well ( done many time...) but same probleme.

In fastboot mode ( with android 9 ) I tried many command to check few things.
I manage to change the slot to boot it in A or B for example, but if I want to boot with TWRP in order to flash the recovery to install everything on both slot, I have the return command (bootloader) boot.img missing Cmdline or Osversion when I try to do fastboot boot twrp.img.

I know that it's nearly not related to UT but I didn't find any tips on XDA and there is more active users here with 3a.

Thanks in advance.

Tchan

[arubislander]

@tchan could you try putting your sim card in another phone? This is to determine if the problem is with your device or with your provider settings.

[tchan]

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[tchan]

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[tchan]

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[tchan]

@arubislander
Thanks for answer,
Of course I have my other phone under UT still working with the same Sim.
Sure there is a problem with the modem.bin
in partition a and b to do cause I done something wrong first, or the phone had never work properly but can't know that now.

Thanks

[AppLee]

Hi @tchan

When I read your issue, my first thought was the modem might be overheating and shuts down as a failsafe.
Now image issue is still possible but if it's the same with android and with Ubuntu Touch and you did the flashing multiple time then I guess the hardware issue is the more probable.

To test my hypothesis you can try to download a relatively large file in 2G, 3G and 4G... as I suspect maybe not all are being handled the same.

[tchan]

@AppLee

Hi,
I think you are right, I didn't managed to download a 600 MB file...
I will retry few things but as you say maybe the modem is dead...

Sorry for the late answer.

[AppLee]

Hi @tchan
No problem, I'm just happy to help troubleshooting.
Sadly it does not really help fixing the issue but at least you have a better understanding of it.

[MrT10001]

@tchan What is it like downloading on Wi-Fi and Bluetooth? What is GPS location like? It could be weak battery.

[tchan]

@MrT10001
Hi,
Actually I retried downloading with 4G and it worked...
Battery looks fine, many days without charging ( android 9 ) but I don't use it.