Use the BLE tracking app to search your device if it's nearby. You can see the device with it's range.
Use the Tile app to ring your Tile if it's nearby. Just tap the ‘Find’ button.
When your Tile is not nearby, you'll see the last time and place it was updated on a map so you can retrace your steps.
If you lose your Tile, select the “Notify When Found” option. When any user in Tile’s global network comes within range of your missing item, the Tile app will notify you about its most recent location.