T-Mobile’s “Switching Made Easy” wireless campaign is being made difficult for the carrier to get off the ground because of lawsuits filed by rivals.

AT&T this week amended a previous court filing from last December that won a preliminary injunction against T-Mobile’s switching campaign. Verizon has also filed suit against T-Mobile over its ads, claiming they were “systematically mischaracterizing” Verizon’s service.

AT&T’s new allegations filed in the U.S. District Court for the Northern District of Texas charge T-Mobile with making false and misleading statements about how easy it is to switch and the savings customers can realize from switching. T-Mobile claims AT&T and Verizon customers can switch carriers in 15 minutes and save $1,000 per year. Verizon filed its lawsuit against T-Mobile this month disputing the advertised savings of $1,000.

AT&T’s filing said T-Mobile’s 15-minute claim only applies to the time to check out, while it could take days to switch carriers with device activation and transfer numbers. It also said its rival’s price comparisons are "apples-to-oranges" because they position T-Mobile’s low-tier plan with AT&T’s premium plan and include additional optional services and accounts with three lines. AT&T’s new filing said T-Mobile is promising “illusory savings.”

T-Mobile’s advertising includes TV commercials with actor Billy Bob Thornton making the 15-minute claim.

“The ‘supposed savings’ T-Mobile shows the customer are not always based on a comparison between what the customer is currently paying to AT&T and what they would be paying at T-Mobile for a similar plan,” AT&T charged in its filing. “Instead, T-Mobile presents ‘savings’ reflecting the difference between T-Mobile’s discounted rate and T-Mobile’s significantly higher rack rate.”

After filing its initial suit last December, AT&T was granted a preliminary injunction preventing T-Mobile from scarping personal account information about AT&T customers from its computers. AT&T now seeks to make that injunction permanent.

T-Mobile opened its Switching Made Easy campaign at the Las Vegas Grand Prix Formula 1 race in November. T-Mobile set up three pit lanes at the race to entice its rivals’ customers to change carriers.

T-Mobile has not yet responded to the latest filing but issued a statement after AT&T’s December charges saying its rival was “asking the court to help it limit customer choice, rather than earning customer loyalty the old-fashioned way, with a great offering and customer experience.” T-Mobile also denied accessing AT&T servers.