color call
n.— «In Asia, where sales of music to mobile phones outpace CD sales in some places, labels may offer more than 400 different items in connection with a specific album, including ring-back tones—snippets of music that play to callers while they wait for their call to go through—or “color call” tones, background songs that play while someone talks on the phone.» —“Squeezing Money From the Music” by Jeff Leeds New York Times Dec. 11, 2006. (source: Double-Tongued Dictionary)
Further reading
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While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...