After Kyle Rankin confirmed in the other thread that VoLTE was working for him with his AweSIM service, I decided to see if I could get it working with AT&T directly (being as their plan is $70 cheaper for the plan that fulfilled my needs). After promptly receiving the SIM from AT&T, I put it in my Librem 5 and was surprised to see it seemingly successfully connect to and register with AT&T’s network. I even saw 4G in the wireless signal portion of the screen. To my further surprised, calls worked too…but only on 3G. Apparently AT&T’s claim that they shut down their 3G network on Tuesday was not completely true, as I was able to make and receive calls on the 3G network. That said, 3G is being killed, so I attempted to get VoLTE working by running the commands that are supposed to enable VoLTE for my Librem 5’s BM818 modem. Unfortunately, calls were still not going over VoLTE. I then spent at least an hour on the phone with AT&T, going back and forth with the representatives. At the end of it, I think they may have killed my AT&T 4G data, as my Librem 5 stopped being able to use data when only 4G was enabled. The AT&T representatives claimed that my phone is incompatible with AT&T’s network, which means either: one, the AT&T representatives are incompetent and are only reading off what they see on webpages about compatibility (quite likely), or two, Purism’s AweSIM service actually won’t really work on AT&T’s network, either (which is also possible, although I would like to think that maybe Purism could fight AT&T better than I could to get 4G and VoLTE working).
All that being said…I’m probably going to kill my prepaid plan with AT&T. I now have the choice of trying T-Mobile (or an MVNO running on T-Mobile’s network) or trying the AweSIM service (which is stupid expensive for what I need).
If VoLTE doesn’t work on T-Mobile’s network, an AweSIM subscription may literally be the only way to have VoLTE voice calling on the Librem 5 in the USA (assuming Purism can actually get and/or keep their MVNO service working on AT&T’s network).