TracFone, a major provider of prepaid mobile phone service, must keep its promise to let customers unlock their devices and transfer service to competing carriers, the U.S. Federal Communications Commission said.

TracFone must transition to unlockable phones in a settlement announced by the FCC Wednesday. In addition to the TracFone brand, the company provides pay-as-you-go mobile service through the brands Straight Talk, Net10 Wireless, SafeLink Wireless, Telcel America, Simple Mobile and Page Plus Cellular.

TracFone, with about 25.7 million U.S. mobile customers, violated FCC rules by failing to live up to promises that it would unlock phones for customers enrolled in the agency’s Lifeline program, a subsidized mobile program for low-income people, the agency said.

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