T-Mobile will no longer keep its word from before about not raising prices،

Contrary to TMobilePrice Lock's current commitment to protecting you from carrier-controlled price increases as long as you don't make any changes to your plan, the new version makes no mention of maintaining existing prices. Instead, it will only bind TMobile to pay your last bill of the month in case a price hike makes you want to leave. You will need to notify the company within 60 days of a rate increase to have them pay your last month's recurring service fees.
If you don't plan to remove or change your current plan, TMobile will keep its previous promise to freeze prices. The new guarantee will apply to those who add new lines starting January 18 and those who change their current plan or move to an ineligible plan.
If you don't like the new policy and plan to open a new account or add new lines in the future, you might as well do it now before the current price lock commitment is phased out .