I was literally just thinking today that it's wild that t-mobile has been honoring my simple choice plan prices from 2010. I jinxed us! If they could raise the price at any time i'm amazed it hasn't happened before tbh.
Pretty sure the original contracts have all expired, and these are now month-to-month renewals. IOW, when the current contract expires at the end of the month, it will not be renewed by T-Mobile. They are offering a similar, slightly modified version (at a higher price) if you would like to take them up on it.