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What is two-factor authentication?
Is there a fee for two-factor authentication?
How do I activate two-factor authentication?
What do I do if my code is not accepted?
I have changed my phone number and am no longer able to log in, what do I do now?
I don’t have my smartphone on me, what do I do now?
I received a deactivation code by mail, what do I do now?
I've got a new smartphone, what do I do now?