IOS 15 release Apple closed ICCID black solution machine will not be activated disable use

With the release of apples new operating system iOS 15, older models in the past will be able to experience the functions of the new operating system via OTA. However, it is worth noting that in order to boost sales of the new iPhone 13, it is reported that Apple has closed all ICCID today, that is,  Some hacks with locks may not be able to update the system or even be activated again.