T-Mobile has begun another wave of price hikes, this time hitting customers with legacy plans.

A leaked memo obtained by CNET prepared the Internet for the price hikes. (Full disclosure: CNET is owned by Ziff Davis, the same parent company as Mashable.) In the memo, T-Mobile said this week it would begin raising prices for some subscribers. John Freier, president of T-Mobile’s consumer group, noted that the price hikes were due to “rising costs over the past several years.