To update you all: I called the repair center and told them that my receipt didn't have the serial number on it. She says that it should have and they can't fix it under warranty without it. So I call Compusa and they tell me that unless it is a computer, it should not have the ESN on the receipt. She actually pulled up my receipt and it didn't have it on their records as well. She is going to send me a copy of my receipt on letterhead stating that the ESN wouldn't be on the receipt. She was supposed to fax it but I never received it (after 4 attempts and 2 different fax numbers). She mailing it. I don't know if it's was a glitch in Compusa's system. I did buy it while they were going out of business so that may have alot to do with it. I talked to Nokia and they said that if Compusa sends something stating that they sold me a 770 with that ESN on it, they would except it. But Compusa says that they can't say that because they don't show the ESN. We'll see.