If I change my icloud will my apple ID work?

I changed my apple ID on my IPhone. But when I go to update and app the old apple ID is still coming up. I'm still logged in as my old ID on icloud. If I change the ID on icloud will my new apple ID work?

This is a protection against fraud thing. It prevents many people using one account to download 100's of apps for infinate amount of people, you will need to use your old id or re buy/re install it.

I don't think so

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