In a  5 part series by the Office of  National Coordinator and HealthIT.gov has recommended the encryption of PHI on mobile devices:

Utilizing AXIS CloudSync and our built in 448-bit encryption and two-step authentication, you can ensure the protection of PHI on all your mobile devices and securely remote wipe the device in case it’s lost or stolen. Our two-step authentication adds an extra layer of security to your account. Each time you log into the web portal, you will be prompted to enter an authentication code, which will be delivered to you through a mobile app, a text message, or an email, depending on your settings.

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