That's wild. Also, I don't think this solves the "I can win cause I'm rich" problem. I don't think many people can reasonably be expected to want to willingly mail their phone to another person.
Especially, considering that likely means you need to have two phone plans plus two phones. It's pretty hard to say to your friends, family, or boss, "sorry, I can't take calls right now, my phone is in Vermont so my buddy can catch me a Gengar."