The IMEI number is a unique 15-digit serial number assigned to every mobile device, including smartphones, feature phones, and tablets. It serves as a device identifier, allowing mobile network operators to identify and authenticate devices on their networks. The IMEI number is crucial for:

: A dedicated utility for Spreadtrum devices that allows users to input the 15-digit code and flash it to the phone via a USB COM port. Avengers SPD / Miracle Box

Look for an option labeled Set IMEI or Radio Information .

These codes open the — a hidden menu for hardware testing and parameter modification.