I too tried T-Mobile and was unsuccessful with getting VoLTE working. Purism released the SIMple service plan, which is cheap enough for me to justify paying for it because the vast majority of my life is in trusted WiFi range), and that works, so I now have a usable Librem 5 (which is cool). That being said, the whole “Purism devices allow for freedom!” notion is a bit nonsense in my opinion. At least currently, you are free to have a Librem 5 that is a pocket computer in a smartphone form factor, but if you want to have a Librem 5 that actually operates as a phone, the only guaranteed way to do that is by buying your cellular service through Purism. Your freedom is constrained by its functionality (or lack there of) on cellular service plans other than Purism’s MVNO.
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