T-Mobile US Inc. reached an agreement to stream live Viacom channels like MTV, Comedy Central and Nickelodeon as well as offer on-demand shows on its coming wireless TV service.

Under terms of the deal, Viacom’s portfolio of brands — including MTV, Nickelodeon, Comedy Central, BET, Paramount and more — will play a key role in T-Mobile’s delivery of new mobile video services later this year.

Last year, T-Mobile acquired Layer3 TV, and with that team and technology, the company has been at work readying its first wave of home and mobile TV offerings. In recent months, T-Mobile executives have shared some of the company’s plans to launch first with an in-home TV solution, designed to replace cable for the 5G era, and longer term, executives say the company will introduce mobile TV services.

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.

When the product is ready, T-Mobile TV will be entering a crowded field of online TV services including AT&T’s DirecTV Now, Google’s YouTube TV, Dish Network’s Sling TV and Walt Disney’s Hulu.