i cannot access my facebook account?

i cannot access my facebook account. in checkpoint ask to save New Device Name, when i save it again ask to save New Device Name with this error “The phone number is invalid.”. i cannot bypass it. i am not try to connect from phone i try to connect from my computer. please help me. i try from another computer/browser but result is same
http://s9.postimage.org/4bxsgpyof/facebook.png