The IMEI number is a unique 15-digit code given to every smartphone. It can help you locate your phone if it's lost or stolen, or remotely lock it down.

If you grabbed one of the best Android smartwatches and added it to your AT&T account, your watch has its own unique phone number.

Why does my Android smartwatch have a separate phone number? It's normal for watches to have a different number from the one associated with your mobile device.