T-Mobile is retiring some older, grandfathered wireless plans and automatically moving affected customers to current plan options, which can increase monthly bills. Multiple outlets report that customers are notified in advance and that the plan changes take effect during the next billing cycle or beginning this week, depending on when the migration is processed. The retired plans are described as having limitations such as slower data speeds and capped or limited “premium” data. Some customers may see an increase of about $4 per line per month, with some reports citing increases up to around $6 per line per month. T-Mobile’s newer plan lineup is described as including options such as Essentials, Essentials Saver, Experience More, and Experience Beyond, with pricing that starts around $50 for a single line. T-Mobile also indicates the move is intended to eliminate more than 1,100 legacy billing codes. The company does not specify which exact legacy plans are being retired, and sources say thousands of subscribers are affected. Customers can change to a different T-Mobile plan or switch carriers if they do not want to remain on the migrated options.