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A comment on The Presence of One’s Own Smartphone Reduces Available Cognitive Capacity. Parent comment

Re:The Presence of One’s Own Smartphone Reduces Available Co... by AlexCoventry on Tuesday June 27, 2017 @02:03AM (#14642875)
Google Authenticator works fine with an offline device, and SMS-based 2FA is insecure.
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Re:The Presence of One’s Own Smartphone Reduces Available Co... by richardknop on Tuesday June 27, 2017 @06:50AM (#14644079)
Right, but you still need a device. So you can just switch your smartphone into airplane mode and only turn the airplane mode when you want to make a phone call / use wifi.
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Re:The Presence of One’s Own Smartphone Reduces Available Co... by AlexCoventry on Tuesday June 27, 2017 @02:15PM (#14647798)
You need a device, but you don't need a cellphone plan.
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