feature to ensure no apps or people had unauthorized access to his data. He also cleared his Safari website data to wipe any traces of the malicious site he almost visited.
No. Even DFU restores or iOS reinstallation leave the SEID intact. It is hardware-based. seid iphone check link
How to find the SEID on an iPhone
: Malicious links often claim your phone is "hacked" or "stolen" to trick you into entering your Apple ID, password, or device passcode. feature to ensure no apps or people had