(Telecompaper) T-Mobile US announced changes to its 'Binge On' offer for zero-rated video streaming. When first launched in November, the service limited the video resolution in order to conserve data. The operator said it's now allowing video providers to choose to stream their services at native resolution, up to Ultra HD. This was one of the reasons that YouTube notably did not join offer to start. YouTube is now amongst the companies participating, along with the new additions Baeble Music, Discovery Go, ESNE TV, FilmOn.TV, Fox Business, Google Play Movies, KlowdTV and Red Bull TV. In total free data is now available on over 50 video services at T-Mobile. These services represent 70 percent of all video T-Mobile customers watch on their phones and tablets each month, the company said.