iOS

ICCID activation was once a popular way to work around carrier locks on iPhones. If a previously activated device is jailbreakable, its activation ticket can be backed up and restored after a reset, iOS downgrade, or DFU restore. The ticket is device-specific and only preserves activation on the iPhone from which it was saved. Here I use my iPhone 5s (A1453, au/KDDI Japan model) as an example.