Some T-Mobile customers with older cellphone plans learned yesterday that their bills will see a $5-per-line increase beginning with their April or May bills. This comes after the company raised rates last June on other legacy plans.

T-Mobile (TMUS) , one of the largest mobile providers in the U.S. with over 130 million customers nationwide, recently concluded 2024 on a high note. The company raked in a record-high net income of $11.

T-Mobile says that if your plan falls under the "Un-contract Promise," which guarantees your rates won't increase, it will pay your final month's recurring service charge if you decide to leave (as long as you let the company know within 60 days).