Samsung Galaxy Note 4 - Manual (Page 137)

Tools and Calendar 126
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Update now: Check for software updates, and install them, if desired.
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Auto update: When enabled, your phone will automatically check for updates and install
them.
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Wi-Fi only: When enabled, your phone will only download updates when your phone is
connected to a Wi-Fi network.
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Update PRL: Download and the latest Preferred Roaming List (PRL), used by your phone
to access the network.
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Update Profile: Update the user profile related to your wireless service account. If you
choose to change your user name online, use this option to update the user name on your
phone.
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UICC Unlock: Unlock your phone’s Universal Integrated Circuit Card.