I have a Teracube 2e that has stopped making or receiving calls. SMS and data work fine.
My network is AT&T (USA), via Tracfone as an MVNO.
The problem arose on March 17, 2022, apparently after 3G services were discontinued.
From searches on the AT&T forum it looks like the problem is that AT&T has custom standards for VoLTE that my phone is not using. AT&T lists Teracube 2e as an allowed device.
My guess is that Teracube has incorporated AT&T’s VoLTE protocols but that /e/ has not.
I have tried setting up a new APN as described in the teracube forum here:
Is anyone else experiencing this problem? Has anyone found a solution?