Free Caller tune trick for Docomo

The docomo users can get free caller tune in their mobile.Its d trick for getting your  favourite song as ur caller tune with free of cost.Its working100%.  Just dial
*678*035#.
Remeber, you can activate any song as your tune but its free only for 3 days only. Dnt forget to deactivate this.
Just try this and share your comments here..!!