I put a label with my sister's phone # on the back on my phone, she put mine on hers. I didn't want to rely on the phone functioning in case the battery was dead.

No, but I can easily add this info to the lock screen of my iPhone in case I loose it by logging into to iCloud website.

And if it gets stolen, the villain knows where you live and can rob your house too…

You'd better get to work burning off your fingerprints so that nobody can plant them at a crime scene.

ref to a friend not for himself to do not know owner identity because it increase prise of the phone