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m Also known as "2-Step Verification" |
I don't think in 2015 the disadvantage of "not everyone has a mobile phone" is remotely significant to anyone in the world. |
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'''Disadvantages of mobile phone two-factor authentication:'''
* The mobile phone must be carried by the user, charged, and kept in range of a cellular network whenever authentication might be necessary. If the phone is unable to display messages, access is often impossible without backup plans.
* The user must share their personal mobile number with the provider, reducing personal privacy and potentially allowing [[Mobile phone spam|spam]].
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