Viacom brands (MTV, Nickelodeon, Comedy Central, BET, Paramount) will "play a key role" later this year with a TV service launch, the companies say.
It will include live linear feeds of Viacom channels as well as on-demand content.
Viacom is a "cornerstone launch partner" in the service that T-Mobile plans, building on its acquisition of Layer3 TV.
Previously: Report: T-Mobile set to launch mobile streaming TV service (updated) (Jan. 25 2019)
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