By turning this feature on, your iPhone will require you to type in a four-digit passcode whenever you turn on the phone to unlock the SIM. This will prevent someone from making calls with your SIM in your iPhone, or removing your SIM and using it in another phone.
1. Tap your iPhone's Settings app
2. Tap on Phone
3. Select SIM PIN
4. Tap Change PIN
5. Enter the Current Password (for AT&T, the default is 1111. For other carriers check here )
6. Enter the New Password, a 4-digit passcode that you can remember; re-enter it to confirm.
The next time you turn on your iPhone you will be asked to unlock your SIM. If you forget your PIN, you will need to contact your carrier to unlock the SIM.
2. Tap on Phone
3. Select SIM PIN
4. Tap Change PIN
5. Enter the Current Password (for AT&T, the default is 1111. For other carriers check here )
6. Enter the New Password, a 4-digit passcode that you can remember; re-enter it to confirm.
The next time you turn on your iPhone you will be asked to unlock your SIM. If you forget your PIN, you will need to contact your carrier to unlock the SIM.
source: http://howto.wired.com/wiki/Secure_Your_iPhone
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