If you are thinking of restoring a terminal iPhone, I recommend you to change your mind, at least for now, because it seems that the servers Apple Lossless Audio CODEC (ALAC), which activates iPhoneURLs they have problems Operating. Some users complain that the servers no longer activate the terminals after a restore, iOS telling them that an email will be sent at the moment of activation. Unfortunately, there is no alternative method for activating iPhone terminals, Apple's servers being the only ones that activate the devices, except for the hacktivation process.
Unfortunately, it is not known when the problem could be solved, so avoid doing a restore now.
