The deal could be worth up to $1.35 billion.
The move would allow T-Mobile to more directly operate the brands, which already run on its web link.
After getting regulatory approval, the carrier anticipates closing the deal on May 1.
“We are really looking forward to welcoming them to the ‘uncarrier’ family.
The FCC says the agreement will allow Mint Mobile and Ultra Mobile customers to more easily switch service providers.
Update, April 26 at 1:33 p.m. PT:Added information from FCC spokesperson.
