WIND/AWS/MOBILICTY MOBILE QUESTIONS!?

I cannot afford an iPhone, and I am really just looking for a simple phone with a slide-out or regular QWERTY keyboard. The company I will probably go with is Wind Mobile. They don't really have any phones I like. Mobilicity has 1 phone that I REALLY like but I can't buy it from there and put a Wind Mobile sim card in it...or can I? it is the Samsung Gravity Touch but Mobilicity doesn't cover where I live.......HELP
Oh yeah, I live in Canada.