I was trying to send a ringtone from my At&t Blackberry Pearl (8110 running Os 4.5) to a Sprint Qa, it kept on failing saying "Service Unavailable" (Or something of the same context) Anyways, and after 15 minutes of it saying the same thing, the guy I was trying to send the stuff to said that he couldn't bluetooth OR text one of his other At&t friends. Has any one else had this problem? Is there a solution?