I changed my login email - now my iPhone 4 will not let me download or update apps!

Hello, vsarge.

Thank you for visiting Apple Support Communities.

It sounds like you changed the primary email address associated with your Apple ID and need to update this information on your iPhone. Here is the article that will walk you through what services you need to sign out, then back in with the updated Apple ID. See all sections that reference iPhone.

What to do after you change your Apple ID email address or password

Cheers

I Know that you have posted this question a couple of times now and you are not getting anywhere. I realize it must be extremely frustrating. The last discussion that we had you said that tapping the ID does not give you the option to sign out. When you tap your ID, do you get any options at all? Is there any response whatsoever when you tap your ID in the settings? Can you access other settings in the settings app and make changes?

I can't remember if we discussed this, but it just now struck me. Did you try Settings>General>Restrictions>Allow Changes>Accounts>Don't allow changes? If you restrict allowing changes, the ID is greyed out and non responsive when you tap on it.