Apple IPHONE4/4S/5 upgrade iOS7 After restore factory settings can not activate the phone

Problem reason

4s upgrade ios7.0.3 WiFi is broken, and then restore factory settings, but what if you can't activate the iphone when you connect to itunes?

Solutions

First, the iphone can not be activated, it is recommended that you update the latest version of the mobile phone system ios7.0.3, generally can be resolved.

Second, in addition to activate the problem available WiFi, mobile network, or data cable +pc to connect itunes, three ways;
1, look at your tips, like the phone and itunes Apple server is not connected. Try a few more times.
2, or WiFi and data lines in this way, note that the computer to install the latest itunes.
3, if it appears: there is something wrong with your iphone. "I'm sorry, the iphone you're connected to can't be identified. Thus can not activate the use of "on the phone has a problem, is hard to change machine (demon machine)