Apple id
My iPhone prompts me to use my old apple id and password to update apps, and sends a verification code to a phone number i no longer use, what should i do?
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See if anything here helps. If necessary, you can use account recovery as explained in the link at bottom of the article.
Verification code - how to get one and sign in with two-factor authentication
One option is to delete the apps/purchases made by the other ID and download them using the new ID if desired. If necessary, check your purchases history to see which apps/purchases weren’t made by the current ID.