Sprint's got a nice head start in the 4G race over Verizon and AT&T -- a message it's heavily broadcasting these days -- but with the onslaught of LTE networks and equipment around the world now just months away, momentum is unquestionably going to shift, giving the carrier every reason to act quickly to build out now and score as many subscribers as it possibly can. That seems to be the gist of a rumor coming out of AndroidGuys today that says Sprint is working on a deal with Walmart to install WiMAX cells on all (yes, all) of its locations, a move that would give it a significant boo
