My iphone 4S wont allow me to restore a bckup of icloud it has just rebooted the os and for over 24 hours i have been trying to fix it i use this phone for my job so i need help

My iphone 4S wont allow me to restore a bckup of icloud it has just rebooted the os and for over 24 hours i have been trying to fix it i use this phone for my job so i need help. when i try to restore it says "Your iphone could not be activated becuase the activation server is unavailable, If the problom presests goto apple.com/support" It has done this for 27 hours now PLEASE HELP!!!!!!!!!