My iPhone keeps asking me for my apple I. D password?

I changed my apple Id and password. Whenever I go to the App Store from my iPhone it asks for my new password to my new apple id which is good. But at random times when I'm texting or something, the old Id will pop up and asks me to type in my password. I don't know how to fix this but it's driving me crazy. :/

I know if you go to setting's and scroll to iTunes and App Stores you can change it to your new one, but i think you have the automatic app's update on, which is on the same place, turn it off, and hope thats it

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