Samsung Galaxy S4

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I can't turn on my mobile phone

Possible cause 7 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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Samsung Galaxy S4