Why can't I sign in to iTunes on my iPhone 5s?
WHEN I TRY TO DOWNLODE WHATSAPP IT ASKS ME TOSIGN IN INTO ITUNES WHEN I TRY TO I AM NOT ABLE TO DO SO
[Re-Titled by Moderator]
Beause the iPhone 5S is running iOS 12.5.7 it could well be that your apple account with 2 factor authentication is not supported for a direct sign in
get a verification code from settings on another trusted device and try to sign in with that instead of your password on the 5S