Device Guides

Apple iPhone 12 Pro

iOS 16.0

iOS 15.0

iOS 14.1

iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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I can't turn on my mobile phone

This troubleshooting guide will take you through a number of possible causes to help you find a solution to your problem.

Possible cause 2:

Your mobile phone isn’t turned on correctly: See how to turn on your mobile phone.

List view

1. Turn on your mobile phone

Tap and hold the Side button until your mobile phone is turned on.

Slide your finger upwards starting from the bottom of the screen.

2. Enter PIN

If your SIM is locked, 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.