Can an unregistered sim be traced to an unregistered pay as you go cell phone through the imei number can the imei be traced just from the phone number of the cell that made the call or sms?

An unregistered SIM card can be challenging to trace, as it lacks associated personal information. However, the device's IMEI number can be used to identify the phone itself. If an unregistered SIM makes a call or sends an SMS, law enforcement may be able to trace the call through the network provider, but linking it directly to the IMEI without additional data is difficult. Typically, a phone number alone does not provide sufficient information to track the IMEI without the cooperation of the mobile carrier.