Virgin Mobile is offering its customers exclusive ringtones of tracks from current albums by Ashanti and Ja Rule. Both artists are signed to Universal Music Group's Def Jam label.

Virgin Mobile is offering its customers exclusive ringtones of tracks from current albums by Ashanti and Ja Rule. Both artists are signed to Universal Music Group's Def Jam label.

Mastertones from Ashanti's "Concrete Rose" and Ja Rule's "R.U.L.E." will be available exclusively to Virgin Mobile wireless customers through Feb. 15. The exception is Ja Rule's single "Wonderful," for which the exclusivity period ends Jan. 15.

This is the fourth "First Dibs" ringtone deal Virgin Mobile has struck with UMG this year, following similar pacts with Sum 41, D12, and G-Unit's Lloyd Banks and Young Buck.

"R.U.L.E." debuted last month at No. 7 on The Billboard 200 and has sold 381,000 copies in the United States, according to Nielsen SoundScan. "Concrete Rose," released Dec. 14, is expected to debut on The Billboard 200 this week.