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With the Vault system, one of two sleeves is attached to the iPhone: One that can read a smart card or one that can read a microSD card, he said. Once either of the sleeves is in place, inserting the microSD or smart card becomes one component of the two-factor identification process, while typing in a PIN is the second. Once authenticated, users would have access to Good for Enterprise email.
Read the article to learn more about protecting access to the iOS platform.