Mac Rumors has received unofficial word that Sprint may become a carrier of the iPhone as early as this summer. The site points to skeptical claims made by a Sprint employee who has been reliable in the past and to a TechUpdate post covering information from a BestBuy employee who has similar information.

We reported recently that AT&T’s iPhone exclusivity may be under threat from other carriers and that it narrowly avoided losing sole rights to iPhone tariffs by offering a very competitive data plan for the 3G iPad. Verizon is the most hotly tipped network to take on the iPhone but, should AT&T’s exclusivity come to an end, Apple may well consider multiple iPhone carriers as it has done in Europe. As Mac Rumors points out, multiple contracts would also see a boost in iPhone uptake as has been seen with Android-based handsets. TechUpdate’s unnamed BestBuy employee feels that AT&T’s exclusivity has already been lost with the blow softened by exclusive iPad tariffs in the meantime.

Steve Jobs is set to host a Keynote at the start of Apple’s World Wide Developer Conference on June 7 so perhaps we will find out more then.

[ via Mac Rumors ]