Ok So some sites on the internet still say that Verizon may be getting the Iphone 4 by christmas 2010 they have to re design it to work with CDMA (Code division multiple access) whitch is the type of network that Sprint and Verizon Use. AT&T and T-Mobile Use GSM (Global System for Mobile Communications). Nextel Uses iDEN (Integrated Digital Enhanced Network) by Motorola. CDMA is faster tham GMS and iEDN.
If this Happens Sprint Will Be Able to use the iPhone on there network also. Weather or not they will sell it is another story.