I was recently at an event where an AT&T VP was speaking. During the Q&A he was asked about how they looked at Comcast as a threat. His response was that Comcast was absolutely not a threat because Comcast does not have a wireless network.
Comcast's wireless side is just a way for them to say that they do quadruple play, competing with Verizon and AT&T. They aren't a wireless company, just like AT&T apparently isn't a DSL company. Low caps and high monthly fees mean that wireless is profitable to them, more so than DSL apparently.
reply to Morac They don't own and operate the wireless network like AT&T does theirs. We may see a Sprint / Clearwire merger in the future and then we may see Centurylink or Comcast try and buy that company.