Need help with Apple ID

Greetings,
I'm getting no help from Apple support. I recently changed IP's and cannot get my Apple ID in my iPhone updated. I have no problem logging into iTunes with my new ID. I've changed the info in the iPhone via the Settings/Mail,Contacts,Calendars and updated the accounts to my new settings. My problem is when I try to update some apps it takes me to a window that asks for my password and the Apple ID that is displayed above the password window is the OLD Apple ID and when I enter the correct password it says I've entered the wrong password. That password works fine in iTunes and is the same as I entered via settings. I've reset everything to factory defaults and reloaded from my backup and it all reverts to my original Apple ID not the new one. That makes me thing that the problem would be with iTunes but it displays the correct new ID and accepts the new password.

Can someone please help me?

Thanks,

Art

 

Thanks, NormanBates! That did the trick. I don't know why Apple support couldn't tell me that during the six times I contacted them. I will have to remember that secret when other apps need updating.

Thanks again.
Art