Smartphone Questions? Ask A Smartphone Technician for Answers
How do I change the default apple id on my iPhone 4s?
On your iPhone 4s, Go to Settings, Then scroll to the bottom and select Store, From there if you see your apple id, select sign out. then select sign in.Otherwise just select sign in. Then you will have the option to create a new apple id.
My new apple id is shown correctly on the settings as you described but my problem is when I try to download or update apps from the apps store ,my old apple id comes up as the default and it will not accept my old password either. I changed my apple id after I gave away my old iPad.