Follow the on-screen prompts to find the AirTag, or Press Play Sound If you see that the AirTag is a hundred miles away and you're never going to get it back, you can do the above and then swipe up for more options. Under Lost Mode, tap Enable. Doing that initially gets you another information screen, which reassures you that nobody but you can pair with this particular AirTag. It also says you will be notified when the location is found. And it also lets you set up what happens when someone else finds your AirTag. You can enter a phone number and a message that will be displayed when they do.