Not recommended. The app is misleading. For legitimate phone tracking, use built-in features like Google’s Find My Device, Apple’s Find My iPhone, or carrier services. If your phone is lost/stolen, report the IMEI to your carrier and police—don’t rely on third-party IMEI tracker apps.
Most mobile carriers require a police report to officially "blacklist" an IMEI, rendering the phone useless on any network. Conclusion Imei Tracker 4.1 App
If you were to use a legitimate IMEI tracking service (usually reserved for law enforcement and carriers), the process looks nothing like a standard app. It is a back-end network operation. Not recommended