Why couldn't activate FaceTime on my iPad?
I couldn't activate FaceTime on my iPad. Yesterday I could use FaceTime normally with my AppleID but today what's happened! When I opened Face time on my iPad , it told me to sign in with Apple ID to activate Face time. I signed in with my ID correctly, but it still showed that "could not sign in, please check your network connection and try again" . My network was no problem, I could use Internet to browse normally and I could use the same Apple ID (as I used on iPad) to Face time with my Face time app on MacBook Air. (Normally, I used the same Apple ID for Face time on both iPad and MacBook Air with no problem at all.) I tried to solve many times including signed in with 3 others Apple ID, checked for no restriction, checked for date and time, reset both Face time app. and iPad, but it didn't work. How should I do next?
iPad 2, iOS 6.1.3