T-Mobile is letting some legacy plan customers know that a price increase is coming, 9to5Google reports. Many Reddit users on r/tmobile said the carrier sent them text messages that their plans will raise by $5 per month per line starting on April 2nd.

In an internal memo obtained by CNET, T-Mobile consumer group president Jon Freier says the price increase addresses “rising costs” for the company. The memo noted that affected customers would be notified by the end of the day today.

CNET says it’s unclear which legacy plans will be affected but notes that Go5G, Go5G Plus, and Go5G Next subscribers won’t be subject to the price hikes. T-Mobile had already increased the rates of some of these older plans by $2 to $5 last year, and Freier apparently notes in the memo that “no line that received a prior increase will receive an additional adjustment as part of this initiative.”

“While most customers are not included, we’re wrapping up the price adjustments that began last year in response to rising costs,” T-Mobile says on its support account on X. “We are still committed to providing low prices and the most value across all plans.” The account also says that these changes should not affect customers with Price Lock.