A:Answer I own and use the S9+ Unlocked bought from Best Buy. It supports wifi-calling, lte, and hotspot on tmobile sim card. So the answers to all your queries are yes, yes and yes. Just remember to buy a shock resistant case with it immediately. I use an Incipio Dualpro for S9+ with mine but the choice is yours. Choices from makers like Incipio, Speck, Tech21, Otterbox, Modal, etc.