AT&T (NYSE: T) has secured a deal with Viacom’s MTV Networks (NYSE: VIA) and BET to run content across a number of its platforms, including TV and wireless. The announcement continues a trend in which carriers look to leverage existing content relationships to create reasons for subscribers to sign up for new services and is a vote of confidence from the content companies that they are willing to play along. The agreement includes adding high-definition channels to U-verse, including MTV, VH1, CMT, BET and Nickelodeon; adding international channels, like MTV India; renewing existing channels, advertising expenditures, and securing content for its in-car service CruiseCast. The CruiseCast service, which uses satellites, will include five MTV and BET channels when it launches in the spring. Release.