From help app on the device:
About SIM security--
Quote:
You can protect your SIM card with a PIN code to add another level of security to your BlackBerry® device. If you lock your SIM card with a PIN code, other people cannot use their SIM card in your device. Before you can use your SIM card in another device, you must type the PIN code.
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Protect your SIM card with a PIN code--
Quote:
To obtain your SIM card PIN code, contact your wireless service provider.
Note: If you type the SIM card PIN code incorrectly three times, your SIM card does not function.
On the Home screen or in a folder, click the Options icon.
Click Advanced Options.
Click SIM Card.
Press the Menu key.
Click Enable Security.
Type your SIM card PIN code.
Press the Enter key
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Change SIM card PIN code--
Quote:
On the Home screen or in a folder, click the Options icon.
Click Advanced Options.
Click SIM Card.
Press the Menu key.
Click Change PIN2 Code.
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Posted via BlackBerryForums.com Mobile