But then you need to write down those codes and carry them with you, unprotected by phone pin.
Not too many ways of solid security without providing a phone number in most platforms--I guess besides Google security key?
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I use a U2F key where possible, followed by TOTP, and SMS as a last resort. For SMS in most cases a Google Voice # works.
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It's very hard to convince people to use U2F & Google Voice isn't available in all countries but that would be a good order.
End of conversation
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