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You can still press "don't have your phone?" and send a code through SMS, unless there's a way to disable that.

Yes. You can disable it.

Wait what? What good would receiving an SMS be if you don't have your phone?

It goes to a backup number you add that is the phone number of a friend or other phone number you specify.

Don't do what I did and stupidly use your google voice number. facepalm