Volte and T-mobile
#1
I have loaded many different Operating systems and while I can get ATT / Cricket to work well ,I have had no luck what so ever getting  any OS to recognize the T-mobile Sim. Tried loading atinout, modem manger and other software to no avail.  I am trying to avoid using the modem update software since I don't want to risk trashing the modem. Heck, flashing my Bio makes me nervous.  Has anyone found a way around my problem?
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#2
Check my post https://forum.pine64.org/showthread.php?...8#pid85368 for VoLTE settings / modem AT commands, it might help.
I don't have a SIM for an operator that has VoLTE enabled but you should be able to check for yourself (presuming the SIM works on VoLTE with another phone).

There is a "Commercial-TMO_VoLTE" profile in the modem so that would presumably be used automatically if VoLTE is enabled - you can also set it manually yourself.

Hope that helps.

There's also a thread for confirmed 4G VoLTE working here https://forum.pine64.org/showthread.php?tid=12560 if you get it to work. That should help, too.
Pinephone v1.2 UBports CE. Adelaide, Australia using Aldimobile SIM with Mobian SD card.
Manjaro Plasma Mobile on EMMC.
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