Right now Comcast isn't offering a mobile phone service, but they will. And what way better to market to take away the customer from their biggest competitor, AT&T, than with an easy to use, and well thought out iPhone application.
What i find so funny here is that Comcast has this app out and running on the iPhone today, offering convergence management (or at least promising to) is that AT&T's UVerse has a similar remote that's good for setting up your recording of programs remotely (don't want Bubba to miss the big game when he's on a hot date) but they have yet to integrate the voice and email functionality the way Comcast did, as Ma Bell is really only offering a video remote control to the set top box.
But the inside ambush play is well at work here because the app is free, it is delivered over the AT&T network and works over the AT&T Network.
Isn't "open" a wonderful world :-)