Apple's new music streaming service will no longer count against T-Mobile's limits on high-speed data. T-Mobile announced the expansion of "Music Freedom" today, which in total exempts 33 music services from data limits imposed on certain customers.

"Apple Music has become the single most requested new addition to Music Freedom and counts for a full 80% of the requests coming in via Twitter. I heard every one of them, so it’s happening right now!" T-Mobile US CEO John Legere wrote today.

T-Mobile today also said that customers who buy the iPhone 6 this summer under its so-called "JUMP! On Demand" installment plan can swap it for the next iPhone without any new fees "and no change to your monthly payment."

Apple's iTunes Radio service was already exempt from T-Mobile's data limits for the past year. But Apple Music is a new service that lets users stream any song they want instead of radio stations that play songs in a random order.

T-Mobile created Music Freedom a year ago, initially exempting services including Pandora, iHeartRadio, iTunes Radio, Slacker, and Spotify. T-Mobile also exempted services from its partners Samsung, Rhapsody, and Beatport but has avoided regulatory action by exempting competitors as well.

Streaming companies do not have to pay T-Mobile for the data exemptions. Services added to the exempt list over the past year include Google, Xbox Music, and Rdio (see the full list here).

Music Freedom is included in T-Mobile's Simple Choice plans, which provide a monthly allotment of high-speed data and then limit speeds once customers use it up. In addition to making music services exempt from counting against the high-speed allotments, T-Mobile allows music to stream at high speed even after a customer hits their data limit.

"If you reach your 4G LTE data limit through other means your on-network data will be slowed to 2G speeds but music streaming through included services will not be slowed down," T-Mobile says.

There is one edge case in which music services could be slowed down for Simple Choice customers. Customers who buy the unlimited high-speed data plan and use more than 21GB in a billing cycle "will be de-prioritized for the remainder of the billing cycle in times and at locations where there are competing customer demands for network resources," T-Mobile's policy says. There's no carveout for music services here, but the limitation only applies to the heaviest data users and even then only in areas where there's traditionally network congestion. Cell site congestion is determined "based on network statistics for the most recent quarter," rather than in real time.