Do voice calls work (it is a "phone", after all)? Will my texts and emails get through with less than 5 minute latency? Will it jump to wifi when I'm at work or

Do voice calls work (it is a "phone", after all)? Will my texts and emails get through with less than 5 minute latency? Will it jump to wifi when I'm at work or home? If so, that's fine. I'm not trying to serve websites with my phone, I'm merely communicating. And I have run out of energy for fighting an increasingly hostile service provider to bring my $130 bill (which used to be less than half that) back down to earth when it could be $15.