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).

T-mobile is set to increase pricing once again, are you affected and when will the price increase arrive? Here's what we know.

Some T-Mobile customers with older 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.

Price increases start rolling out on April 2. 'We are updating the prices on some of our older phone plans in response to rising costs,' T-Mobile says.