You cannot permanently change an iPhone's IMEI number, even with a jailbreak.
Jailbreaking is the process of removing the software restrictions imposed by Apple, granting the user to the iOS file system. Once an iPhone is jailbroken, it becomes possible to install third-party packages, modify system files, and run specialized tools that would otherwise be prohibited by Apple's security protocols. change imei iphone jailbreak
The premise that an iPhone jailbreak enables IMEI modification is largely a misconception based on the capabilities of older hardware. Modern iOS architecture secures the IMEI within a cryptographically locked, hardware-isolated Baseband Processor. While jailbreaking grants control over the iOS operating system, it cannot breach the hardware-enforced write protection of the baseband OTP memory. You cannot permanently change an iPhone's IMEI number,