Lost my iphone
my friend lost his iphone together with the phone that is used to send the verification code. How to get the verification to a different phone
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They need to change the number on their Apple ID.
Apple ID - Manage https://appleid.apple.com/#!&page=signin
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