Tap and hold the Side button until your mobile phone is turned on.
Slide your finger upwards starting from the bottom of the screen.
If your SIM is locked, tap Unlock.
Key in your PIN and tap OK. The default PIN is 0000.
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.
Tap the Top volume key.
At the same time, tap and hold the Side button until the power off icon is displayed.