https://www.vox.com/technology/23954548/lost-broken-stolen-phone-save-yourself

Preparing yourself for the worst is easier than you might think — and it’s never been more important.

The night before I was supposed to go on a long and well-deserved vacation, something very, very bad happened: I lost my phone. I had a friend over and, I decided, he must have accidentally taken my phone with him when he left. Which was a problem because all methods I had to contact him — including his phone number and address — were in the one thing I now didn’t have.