I have an old LG X Charge from Cricket that was actually their first official handset to support WiFi calling.
I'm considering having it unlocked for someone who wants to use it with T-mobile, but I'm wondering- will things like WiFi calling and VoLTE work?
Our T-mobile coverage is pretty weak around here so it is only worth doing if the phone can preserve Wifi calling on other networks once unlocked.

I can't find a lot of info on this handset- it is a variant of the LG X Power 2 but the cricket one might be different from the global one, and it is definitely different from the CDMA Xfinity variant under the same name. Most of my googling has resulted in information about the xfinity version. This is the GSM one for Cricket. No idea what bands it supports either.