AT&T is taking Verizon to court. And even if you haven't heard why, there's a good chance you can suspect the impetus behind the suit filed.
If you've seen Verizon's "There's a Map for That" commercials, you've probably noticed that AT&T's represented coverage area looks nothing like the coverage area AT&T says it provides. In fact, the commercial makes AT&T's coverage look so bad, that some commentators in the blogosphere saw this lawsuit coming probably before Verizon did.
From Apple Insider
With growing talk that Apple may drop exclusivity with AT&T next year and possibly team with Verizon to extend carrier options for Apple customers, the bad blood between AT&T and Verizon has been boiling like never before in recent weeks. The lawsuit obviously illustrates the intensity of the situation.