T-Mobile US Inc. said they reached an agreement to stream live ViacomInc. channels like MTV, Comedy Central and Nickelodeon as well as offer on-demand shows on its coming wireless TV service. Viacom is a “cornerstone launch partner,” T-Mobile said in a statement Wednesday. The third-largest U.S. mobile service has been planning for more than a year to start what it calls a “disruptive TV service,” the launch of which was delayed from last year due to the project’s complexity.

“T-Mobile is on a mission to give consumers a better way to watch what they want, when they want,”  T-Mobile Chief Executive Officer John Legere said in the statement. The company didn’t disclose any details of the service but said it would launch later this year.

T-Mobile is awaiting approval of its $26.5 billion takeover of Sprint Corp. The companies have said the combination would help create a new, stronger wireless company with an in-home TV service that can challenge larger rivals, including cable companies Comcast Corp. and Charter Communications Inc.