After you have updated your iPhone / iPad / iPod Touch, you might run into problems like “unable to connect to server” with iCloud’s new term of agreement. When this kind of problem happen, most people would choose to format or reset the IOS. Sometimes it works and sometimes it doesn’t.
Here is one solution that doesn’t require “Reset all setting” or “Erase All Content and Settings”
The simple solution is to use “Find Friends” app
Sign in with your iCloud address. This apps should come pre installed on your iOS devices.
Click “Agree” to the “Welcome to iCloud”‘s terms and conditions.
After you have done that, you should be able to deal with your iCloud’s Terms and Conditions.
After you have agreed to the new iCloud Terms and Conditions, you should be able to use App Store and any other app that related to iCloud.
CrimsonV2 Apple Review 
Does not work
Have you upgraded your iOS 7 to iOS 7.0.2?
If the problem is still there, try restarting your phone. This time, try deleting and re-adding the iCloud account and then go through the Find Friend app process. It should work.