My iPhone 5 has reset itself and now won't activate..tried also activating through iTunes but says try again later... I desperately need to use my phone!!! Help appreciated x

It keeps saying searching for signal too....

According to this article: http://support.apple.com/kb/TS3694#error21
Error 21- These errors typically occur when security software interferes with the restore and update process. Use the steps to troubleshoot security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See the steps under the heading "Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store." If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.
The error on the Mac is odd though. 2100 is not in the article. What version of the Mac Operating system are you running?

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