Iphone or Blackberry Storm With Metro PCS?

I have both phones but i want to be signed up with metro because all the other services are expensive. So i was wondering if any of those phones can be hooked up with Metro PCS. Thank You.
PLEASE READ; I have seen and heard people get phones from other sevices and set them up with Metro PCS. So I wanted to know if my phones can be set up with it. If not just tell me phones that are really good that can be set up with Metro PCS. Thanks again.