Per a response from @Kyle_Rankin on another thread (seen here New Post: I (Finally) Fired Google ), VoLTE can work with the BM818 (although Kyle was only saying it worked with his Librem 5 with AweSIM service). I don’t really want to spend $100/month for a phone that I mostly only need cellular service for phone calls (as I’m within trusted wifi range 95% of my life), so I’m attempting to get VoLTE working with service from T-Mobile. 4G data works just fine, but calls are only working via 3G (which I believe T-Mobile is planning to shut down in July). My IMEI shows up as fully compatible and not blocked on T-Mobile’s IMEI checker. Does anybody have experience with getting VoLTE to work with T-Mobile or a MVNO running on T-Mobile’s backbone?