It can support VoLTE. I believe it's already deployed in other countries.
Weird. Momentary switches virtually never fail closed.
Sprint doesn't have a bring /any/ device program, they have a bring an approved device program. You cannot bring a Boost or Virgin phone to Sprint unless it's an iPhone.
Yea that's definitely not what the hotspot was designed for. I can understand them cracking down on that.
Unless (s)he works for T-Mobile, extremely unlikely.