Hey. I guess I said this before somewhere... It is not possible to use custom ringback tones on your phone. That is not the way RBTs work. Check out ECT Telecoms for more information. They are not stored on your phone locally or anything. But this is a service provided by your carrier. So Verizon offers ringback tones, Sprint does as well. But you'll have to pay a monthly fee to get them. And moreover (common question) it does not matter what phone you have.