AT&T will lower its pricing for the 8GB iPhone 3GS to $49, according to a Wall Street Journal report. The report claims that AT&T will lower the price from $99 to $49 with a two-year contract due to increasing competition in the smartphone space. Also mentioned as a contributing factor is Verizon’s impending launch of the iPhone, which will signal the end of AT&T’s exclusivity in the U.S. The company will join other retailers,…