Device Guides

Microsoft Lumia 640

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How to

Turning my mobile phone PIN on or off

If you want to protect your SIM against unauthorised use, you need to turn on your PIN protection. Once done, it needs to be keyed in when you turn on your mobile phone. Please note: your PIN doesn't prevent others from accessing the contents of your mobile phone (such as pictures and messages). You can prevent this by turning on the phone lock code.


List view

1. Find "settings"

Tap the phone icon.
Tap the dots in the bottom right corner of the display.
Tap settings.

2. Turn use of PIN on or off

Tap the indicator next to "SIM security" to turn the function on or off.
If an incorrect PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. The PUK can be obtained by contacting Customer Service.
Please note:
If an incorrect PUK is entered ten times in a row, your SIM is blocked permanently. In this case, you'll need a new SIM from Optus.
Key in your PIN (default is 0000) and tap enter.
If an incorrect PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. The PUK can be obtained by contacting Customer Service.
Please note:
If an incorrect PUK is entered ten times in a row, your SIM is blocked permanently. In this case, you'll need a new SIM from Optus.

3. Return to the home screen

Tap the home icon to return to the home screen.
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