The caveat, or danger is that T-Mobile has promised repeatedly to turn off 2G. Right now there isn’t an active deadline, so that either means “not anytime soon” or “at any moment.” With no Volte support in SFOS on the XA2 series, all voice calls gotta drop to 2G. So if 2G goes away, T-Mobile might consider your device no longer compatible with their network – that’s what ATT did when they turned off 2G and 3G before my Xperia 10 II had volte support. On top of that, T-Mo’s 2G service in my area has been degrading lately, maybe passive-agressively pushing users to change their practices.