NetComm CallDirect NTC-6000 Series Quick Start Manual page 12

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Step Five: Unlocking the SIM
If the SIM card is locked you will need to unlock it with a PIN provided with
your SIM card.
You can find out if the SIM is locked by viewing the SIM Status on the Home
page:
If the SIM Status is ENTER PIN as above then do the following:
Click on the "Security" Link on the left
12 NTC-6000 Series Quick Start Guide