AT&T and T-Mobile do not share the same spectrum, for the most part. This means AT&T cellphones do not (and can't) work on T-Mobile towers using existing infrastructure; and vice versa. So, interesting dilemma. Of course, the deal won't come to finalisation before mid-2012 which means "merging" services really can't start before 2013 and won't pick up speed before 2014 ... by which times, gosh knows, the entire industry landscape might look different.
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