lucianojavery
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Two-factor authentication methods like SMS verification cannot be used without internet access. However the SMS verification code will be sent to your phone , regardless of whether you're connected or not. In this way, even in situations in which offline authentication may fail (e.g. camping) users can immediately see something's going on with their account and can take the appropriate steps to stop it from occurring again, without waiting until they're connected again. If you are looking an article source on phone verification service, browse this site.