TonePush allows you to easily and quickly send a ringtone to .. another person's phone so that when you ring them, they'll hear the ringtone that you've set!
It's available for Android phones and it's free!
There is a version on the android market available now. It's a fully functional beta version so you can download it now.
Got an Android phone? Please get in touch!
Glad you asked !Here's the FAQ
Prepare to be awesomified.