Clearwire (NASDAQ:CLWR), Comcast (NASDAQ:CMCSA) and Sprint (NYSE:S) announced a significant expansion of the Clearwire 4G network footprint and key capacity upgrades for mobile broadband customers in the greater Philadelphia metro area. The regional expansion has added coverage for an additional 912,000 people. Now, more than 4.37M people in the Philadelphia area have access to Clearwire''s 4G mobile broadband network. This expansion represents new coverage since Clearwire''s initial launch on October 22, 2009.