Univision Mobile brand and business to independent T-Mobile MVNO Ultra Mobile.
Univision Mobile was a joint venture between T-Mobile and the Spanish language TV network Univision Communications which launched in May 2013. Univision Mobile is sold online and by independent dealers and big box stores including Target. The service targets Hispanic Americans with plans that include unlimited international texting and an international calling and roaming credit. Higher priced plans also include unlimited access to Univision's Uforia steaming music service and access to a UVideos app.
While he transfer undoubtedly means a lot to Ultra Mobile, it doesn't look like customers will see much difference. They will keep the same plan price, phone number, SIM and plan anniversary date. The support phone number and website URL will also stay the same. Univision and Ultra operate on the T-Mobile native network only (no roaming) so domestic coverage won't change either.
Some things will change, mostly for the better. Most plans will get more data. The biggest changes will be with the international features. The international calling and roaming credit on all plans is being reduced. However all plans will get unlimited calling to over 30 countries. The chart below details the changes. Click the image to enlarge it:
The switch over will be staged with a certain number of accounts switched over to Ultra each evening between Feb 1 and Feb 10, 2016. During the switch-over customers may lose service (except for 911) for up to two hours. Customers will receive a text message when their account has been migrated.
Source: Univision Mobile via @HazelVizion on Twitter