CipherLab CP55 Reference Manual page 172

CP55 Mobile Computer
SECURITY TAB PAGE
Tap the Security tab to change SIM card security and PIN code setting.
Note: The PIN verification on the mobile computer allows three chances to input the correct
PIN code. If input fails three times, the SIM card will be locked, and you will need to
obtain the PUK code from your network operator to unlock it
SERVICES TAB PAGE
Tap the Services tab to get phone service settings from your network operator.
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Reference Manual