[akared]

I do not know about charges. From what I can tell when i have a wifi signal connected on my phone i lose my ev (sprint) in it shows wifi on the top. And if I try to connect to like sprint tv it wont let me. So I would guess they cant view your data usage while on wifi. But like I said I do not know this, just my thought.

Also, on my phone the wifi can be reached from all around my house and also all around my office(nether one huge places), I have not really tested signal stregthen or anything, but I defently don't have to sit next to the router.

I am running sprint stock rom.