Phone Numbers

Quinn reportedly got the phone number of a friend at school yesterday. Rob asked if he had a girlfriend now, which Quinn adamantly denied. I guess Quinn was so excited that he slept with the piece of paper it was written on. This morning, he woke up and immediately brought me the phone and his treasured paper.

Quinn: "Mom, I have TJ's phone number. Let's call it."
Mom: "What is it?"
Quinn: "10 9 3 4 8 10 9 2"
Mom: "That's not a phone number, Quinn."
Quinn: "Yes it is. TJ's phone number"
Mom: "TJ's phone number would start with the numbers 523."
Quinn: "OK. His number is 523 10 9 3 4 8 10 9 2"

He showed me his paper. Those WERE the numbers written on it. Except the 9's looked like P's. Which still doesn't help us in getting ahold of TJ.