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Make the most of your Galaxy S4

We can help you get the best from your Samsung Galaxy S4. Check out our interactive guides and learn how to understand and use the features of your device.

Guides Troubleshooting Specifications

I can't turn on my mobile phone

Possible cause 8 of 10:

An incorrect PIN is entered

Your PIN is used to protect your SIM from unauthorised use. If an incorrect PIN is entered, you can't turn on your mobile phone.


What you need to do

Enter the correct PIN.
If you enter a wrong PIN three times in a row, your SIM is blocked and you need to key in your PUK. You can get your PUK on Optus My Account.


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Galaxy S4