"We're standing by our commitment to customers and those who switched to T-Mobile that we won't raise the price of their rate plans," top boss Mike Sievert said in a post-earnings conference call.

Promise of low prices was one of the main arguments for T-Mobile and Sprint when they sought regulators' approval for their merger in 2020.

(Reporting by Eva Mathews in Bengaluru; Editing by Arun Koyyur)