AT&T Z990 Protecting Your SIM Card with a PIN, Setting up Credential Storage, Tap Change SIM PIN

Models: Z990

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Sorting Out Your Phone Settings

Disabling Screen Unlock Security

If you have created an unlock pattern, PIN or password, you can disable it.

1.Press the Menu Key > Settings > Location & security > Change screen lock.

2.Draw the screen unlock pattern or enter the PIN/ password you have created.

3.Tap None.

Protecting Your SIM Card with a PIN

Every SIM card comes with a PIN. The initial PIN is provided by your mobile phone carrier. It’s best to lock your SIM card as soon as you can.

1.Press the Menu Key > Settings > Location & security > Set up SIM card lock.

2.Tap the Lock SIM card check box.

3.Enter the PIN you’ve been given and tap OK.

Changing Your SIM Card PIN

You can change the PIN you’ve been given to one easier for you to remember and harder for others to guess.

1.Press the Menu Key > Settings > Location & security > Set up SIM card lock.

2.Make sure you already checked the Lock SIM card check box.

3.Tap Change SIM PIN.

4.Enter the old PIN and tap OK.

5.Enter your new PIN and tap OK.

6.Enter the new PIN again and tap OK.

Restoring a Locked SIM Card

Put all your confidential passwords in a safe place for future use. If you enter the wrong SIM card PIN more times than allowed, your SIM card will be locked and you cannot access the mobile phone network. Contact your operator for a PIN Unlock Key (PUK) to restore the SIM card.

Setting up Credential Storage

This allows you to select applications to access secure certificates and other credentials.

Enabling Secure Credentials

1.Press the Menu Key > Settings > Location & security.

2.Tap Set password and create a password for the credential storage.

3.Tap OK.

TIP: You can also install encrypted certificates from your microSD card by tapping Install from SD card.

Deleting Secure Credentials

1.Press the Menu Key > Settings > Location & security.

2.Tap Clear storage to clear credentials.

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AT&T Z990 user manual Protecting Your SIM Card with a PIN, Setting up Credential Storage, Changing Your SIM Card PIN