Whenever I try to sign in to iMessage or Facetime on iOS 7.1.2, I always get the same message: "Could not sign in. Please check your network connection and try again." I have already looked on Apple Discussions before and I have tried several things, including resetting all settings, resetting network settings, even resetting my phone to no luck. I don't know if it's my phone, my Apple ID, or something else. Please help!
I have an iPhone 4 running iOS 7.1.2.