I recently found this (I haven't check the source):
> iOS forces users to “activate” devices (including non-cellular) which sets up a remote UUID-linked (also collecting registration IP) database for a given device with Apple for APNS/iMessage/FaceTime/Siri, and then Apple ID, iCloud etc. Apple ought be open to users about “activation” and allow users to avoid it.
https://gist.github.com/iosecure/357e724811fe04167332ef54e73...