Sharp AQUOS Crystal - Manual (Page 432)

Settings 423
2. Touch System updates to use the following options:
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Update PRL: Download 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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Update Sharp software: Upgrade to the latest software available for your phone.