OK...
--My contract with Sprint ends the 1st week of Aug 2008, and I'm outta there.

--I want to get the new 3g Iphone that's coming out this summer, with possibly a cheaper price with a 2 yr contract with at & t ( that's the rumor on the internet).

--Sprint is the only carrier I've ever had, and my question is:

--How does one go about leaving Sprint?, can I go to at & t and have them port my number and cancel at the time?, if so, when should I do this?

Any advise is greatly appreciated!!!!!!!!