No its not, phones have hardware ID's that are used to generate the encryption k...

dogma1138 on March 15, 2016 | parent | context | favorite | on: Last Week Tonight with John Oliver: Encryption [vi...

No its not, phones have hardware ID's that are used to generate the encryption key (on phones with a secure enclave, this isn't even one) I have seen no evidence that there is any specific per phone signing of apple software.