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Two-factor authentication methods like SMS verification is not feasible without internet access. However, an SMS verification code is delivered to your phone regardless of whether you're connected or not. This means that even in instances that offline authentication fails (e.g. camping) users can immediately see something's going on with their account and take the necessary actions to stop it from occurring again, without having to wait until they can connect again. Whenever you would like additional hints about sms verification service, look at this website.