Ziphone Imei Change

: Most users did this to trick carrier systems into seeing the iPhone as a different, non-smartphone device to avoid mandatory data plans or to bypass blacklists. Why People Sought IMEI Modification

If you somehow manage to change your IMEI to a number that belongs to another user, that user will lose service. When the carrier detects duplicate IMEIs, both phones are permanently blacklisted globally through the GSMA database. ziphone imei change

Even these methods fail on modern iPhones (iPhone 6 and newer) due to Apple’s introduction of the Secure Enclave and hardware-level pairing between the NAND flash, CPU, and baseband. : Most users did this to trick carrier

The device was typically put into Recovery Mode (indicated by the iTunes logo and cable on the screen) before being connected to a PC where the command was run. Even these methods fail on modern iPhones (iPhone

ZiPhone was a "dirty" patch. It modified the bootloader in a way that was very difficult to reverse. If the process failed, or if the user later tried to update iOS via iTunes, the phone would often suffer permanent baseband failure. This meant the phone could never connect to a cellular network again, turning an iPhone into an expensive iPod Touch.