You can create a 30sec ringtone for iPhone using iTunes...

http://www.mobilefun.co.uk/blog/2009/01/free-iphone-ringtones/

I have Sprint.  I just had a friend with AT&T try it and it didn't work for him either.  Not sure why though.  It's just a plain 'ole mp3 ringtone.  Oh well.... back to the drawing board!

____________________________________________

Pusher & [flickr-photo:id=3938763689,size=m]

I have Verizon, so... That makes sense (even if it doesn't make sense why it would do that). Twas a good try, though. :)

"Urban legends go well with parmesan and horror. In fact their name is conveniently one and the same: Stevie." {UNdead GirlCo Knight for Sigler}

Triangle voice "Who's there? Who's there? Is it Columbo?"

now I have to change one of my contacts names to columbo for when it ringrings.

Also have "that ain't no fucking cow!" 

He thinks he can see into Fayed's brain and he's thinking about a ham sandwich with mustard. Love it  love it love it!

Of your good taste and awesome ringtones. xD

"Urban legends go well with parmesan and horror. In fact their name is conveniently one and the same: Stevie." {UNdead GirlCo Knight for Sigler}

pending on the phone mp3 may not be compatible.  smart phones for example should be able to take it, but a typical verizon phone might need a midi file or something.  on verizon though, if someone sent it via text as a sound file you can save that sound file to a ringtone...i don't believe format matters in that case.

or, worst case., check out a site like phonezoo (mentioned above) and upload the mp3.  when you build your profile you specify the phone so they know how to encode and send to your phone, specifically for your phone.

hope that helps.