Theft Relief is an Android app developed by Great Bytes Software that helps you keep your phone safe in case it gets stolen or lost. The app sends an email to your registered email address containing your phone's IMEI, IMSI, and SIM Serial, which are unique identifiers that your mobile carrier can use to disable your phone. The email also includes helpful links on what to do in such a case.

This app is a great way to ensure that your phone is safe, and the email feature makes it easy to retrieve the information you need in case of theft or loss. The app is easy to use and does not require any technical knowledge. It is available for free and can be downloaded from the Google Play Store.