Why does call details appear on another phone
Making a call on one of my 5s results in that called number appearing on my 4s in the call log details- what setting do I need to change
Are you using the same Apple ID on both phones and are you logged in on the 4s?
If you are logged in on the 4s, try logging out of your Apple ID on it and then things should just appear on the 5s and not the 4s.