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My ringtones are currently:

Alarm tone: Theme to buffy the vampire slayer (dunno why it just wakes me!!)
Drinking buddy: Wildhearts, cheers remix
Scouting friends(yes i'm one of those!!!): Jambo by the adventure (2007 World Jamboree song)
World of warcraft buddies: Level 70 Elite Tauren Chieften, I am murloc
Anyone else: Stan Bush, Dare (Transformers: The movie - original not michael bay - soundtrack)

I know i'm tragically sad and 'i'll get my coat'
 
The Codec ringtone from MGS. :D Sounds old-fashioned, but nerds around smile when they hear it.

Same here, and the smile you get when you answer with a bluetooth headset it pretty awesome too.

My old phone had the alert noise too, that one was great when the phone went off in lectures and every guy tensed up a little, then realised that they weren't in-game :rolleyes:
 
Mine's still set to "America, F!#k Yeah" from this last weekend... although I need to change it soon probably back to one of the Led Zep ones i've got
 
For personal contacts I have the ringtone from the Japanese film One missed call.
For work related contacts i just have the default phone ring.
 
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