Once again, T-Mobile is mounting direct assaults on its carrier competitors, and once again, reliably brash CEO John Legere is calling them out in public. The self-named "Un-carrier" has Verizon in its sights as part of its newest "Never Settle" promotion, which offers Verizon customers a free two-week trial with T-Mobile. Once the 14-day period is up, customers can either hand their borrowed phone back without charge, or agree to switch over to T-Mobile for good. If they do decide to switch, Legere's carrier will pay off any outstanding payments or contract termination costs up to a price of $650.

It's an aggressive approach, but Legere's company is no stranger to such bullish tactics, having attacked Sprint, other competitors, the FCC, and even Donald Trump in public statements and tweets. Announcing the new promotion, which starts on May 13th, Legere was in similar form, focusing his trademark ire on Verizon specifically. "Last week, I said we would hit right back at Verizon — I meant it," he said in the Never Settle promotion's press release. "With T-Mobile, you don't have to settle for trickery, gimmicks and carrier BS the way you do with Verizon. I'm so confident in our kick-ass network experience that we're footing the bill so Verizon customers can give T-Mobile a try."

Verizon is still the biggest wireless carrier in the United States, with AT&T in second place. The third spot has long been held by Sprint, but earlier this year, Legere claimed that the rapidly growing T-Mobile had knocked its rival into fourth place. Sprint's fourth quarter earnings report, expected on Tuesday, should clarify whether the typically bellicose Legere was indeed right to call his company the third biggest in the country.