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.
I am running /e/ that was installed by eFoundation in August, 2021
I can get voice over 3G, but sms does not work right. Or I can get sms and data over LTE but no voice.
I have followed the steps suggested for similar problems on other networks in these threads, but they aren’t helping. (I have not made a firmware change or been able to test a TMobile sim card though).
I’ve got a similar post on the /e/ forum, but no luck there yet. Would switching to Lineage be likely to help?