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Instead of a standard ringer, or a ringer of a song, moan tones cause a cell phone to make deep, ecstatic moaning noises, as one makes when one has an orgasm, when one recives a call. Popularised by adult film star Jenna Jameson.

(ohh! unhh! yea!) Thats my moan tones, hold on.
by Anternam March 25, 2006
Moan Tones were created and popularized by Moantones.com. They were creating and delivering "moan tones" light years before Jenna Jameson.
Moan tones at moantones.com putting the moan in the phone since 2002
by J Carcinogen March 27, 2007