Professional phone repair shops and resellers often use specialized "dongle" software. These are hardware keys that unlock professional software suites used for flashing firmware or unlocking carriers.
If you are an Android user with USB Debugging enabled, you can connect the device to a PC and use ADB commands. convert imei to serial number
Apple has an official "Check Coverage" page. While designed to check warranty status, it often reveals the Serial Number associated with the IMEI entered. Professional phone repair shops and resellers often use
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