Activating iMessage and FaceTime

MY iMessage and FaceTime was working fine I was checking some setting I the FaceTime settling and I got error message while verifying my iCloud user and password and since then my cell number is not active for Both. the number is appearing in the list alongside iCloud but could not be checked so I am receiving messages through my Apple ID but not through my cell number and whenever I try to activate it agaim I get mess "an error has occurred during activation please try again "