I know this was from awhile ago in this thread, but for future reference, if anyone may need FAST info on their teen's phone calls:
My 15 yr old had her cell phone either lost or stolen at a party. The next morning we went to SPRINT to see if it was being used by anyone.
The salesclerk was able to immediately look on his computer, and he read to us the last 3 texts and calls that were made on the cell. Turned out they were calls my daughter made. And later someone dropped it off and said it was in their purse and someone thought it was theirs and put it there.
Any how, the point being, if your child is missing, you can go to your carrier, and they will tell the parent that owns the account, what the most recent calls/texts were, I am sure. Because they were willing to tell me, and it was only a missing cell, not a missing kid.