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Some users are trying out the instructions in this bug report, so I am adding the instructions to disable VoLTE on the modem.
Note: If you prefer you can also leave VoLTE enabled and in the Librem 5 in Settings > Mobile > Network Mode select any option that prefers a 3G connection this will make all calls and SMS go over 3G while not requiring to disable VoLTE.
My carrier (TracFone, an AT&T MVNO) has just informed me that my phone will soon become useless because of the lack of VoLTE capability. I haven't found that any other U.S. carrier would be any different. So this is indeed becoming critical.
I have tried this on TracFone (MVNO on top of AT&T). I get OK from the commands need to enable VOLTE. The "AT+BMRAT" command shows:
AT+BMRAT: FDD LTE
before a call, and shows:
AT+BMRAT: HSPA
during an outgoing call to a VOIP number. A call to my Librem5 from the VOIP number shows the same thing. Both showed 4G on the Librem 5 display. However, when I call from the Librem5 to an AT&T cell, the display changes immediately to 3G.