Cell phone and headphones, 2014.

A woman relaxing at home listening to her phone.

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T-Mobile, the fourth-largest mobile carrier in the U.S., announced on Wednesday it has added Rdio, Songza, Grooveshark and others to its Music Freedom program, a perk launched this summer that removes all data charges from streaming music through popular services.

The phone carrier also added AccuRadio, Black Planet and Radio Paradise to the Music Freedom mix, plus it said it is close to adding Google Play Music later this year.

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The initiative began in June with a group of seven services that included Pandora, Spotify, iTunes Radio, iHeartMusic, Slacker, Rhapsody and Samsung's new Milk Music. T-Mobile says customers are streaming more than 5 million more songs per day than from the pre-Music Freedom days.

"T-Mobile's Music Freedom and services like Grooveshark are about bringing music accessibility to the consumer," said Sam Tarantino, co-founder and CEO of Grooveshark. "Together with Music Freedom, Grooveshark is creating a new kind of music discovery on T-Mobile devices. We believe the combined global audiences of millions represents a new and engaged audience for Grooveshark on T-Mobile."

Though the Music Freedom program itself is free, users will still have to pay subscription fees for the individual streaming services.

Music Freedom marks the third digital music initiative amongst the top four mobile carriers in the U.S. Two partnerships, Beats Music with AT&T and Spotify with Sprint, give customers reduced, family-plan pricing while placing the music services in large, national advertising campaigns that would otherwise be unaffordable.

T-Mobile is based in Bellevue, Washington.