Wow! Love Your Ring!

While online music services cajole buyers into dropping 99¢ on a pop hit, the wireless industry charges twice that for tinny, 30-sec. cellular ring tones based on the same tunes. And business is booming. Global revenues from ring-tone sales will top $4 billion this year, according to the consulting firm Strategy Analytics. New ways to customize your ring keep coming.

--By Carolina A. Miranda

--From Top 40 to Your Phone

Pop stars from Britney Spears to Tim McGraw are cashing in on ring-tone royalties. The most popular phone tune at the moment: rapper 50 Cent's In Da Club.

--You Heard It...

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