Facebook and messanger

Basically My facebook and messanger everytime i try to sign in (iphone 7 plus) it says error And tells me to try again, its been going on like this for few months now i can’t sign in either of them I tried everything Like Deleting reinstalling, Changing icloud, reseting it all, switching phone off, nothing i dont know whats the problem I can sign in my account using Others Phones and leptops.