A lot of people will be getting the Apple Activation Server error message again today when they upgrade to IOS 6.0- IOS7 – AND TODAY IOS 8
[quote]Your iPhone could not be activated because the activation server is temporarily unavailable. Try connecting your phone to iTunes to activate it, or try again in a couple of minutes.[/quote]in order to fix this do exactly as they say… try again 😉 This is normal for every release of a new OS, perhaps Apple will sort this out in IOS 10