Icloud
If my iphone is lost or stolen and have two factor authentification on when i log in to icloud.com from other device a security code will be send to iphone but...how i get that code if is lost
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You can use any computer internet browser and log into www.icloud.com/find
and no code will be needed.
You can also log into www.icloud.com
and ignore the code request and click the Quick Access to Find My icon.
Note that even though you can log into Find My without a code, I would strongly recommend for other possibilities that you have more than one trusted phone number. Trusted phone numbers can be any phone, including Android or landlines belonging to relatives or friends. See: Two-factor authentication for Apple ID - Apple Support