The phone would report a new IMEI (often all zeros or a user-defined number). However, this was a volatile patch. After a factory restore or baseband update, the real IMEI returned.
If you own an iPhone, respect its identity—the IMEI is its fingerprint. If you have a legitimate reason to modify your phone’s network access, contact your carrier. If you have a blacklisted phone, accept the loss and move on. The days of ZiPhone are long over, and they should stay buried. ziphone imei change
The ability to alter a device's identity brought significant security concerns to the forefront: Identity Laundering: The phone would report a new IMEI (often