need help to unlocka nokia 1600

I need help to unlock a Nokia 1600

IMEI - 358822000078407

Country -Australia

Network - Optus

 

#pw+998 982 110 576 570+7#

 

Came up with "incorrect code" message. any ideas??
ronbar

 

#pw+997 562 110 576 570+7#

Enter codes without spaces
Remove sim first,power on the phone.
After the phone boots up, press #
Press * 3 times fast for (p)
Press * 4 times fast for (w)
Press * 2 times fast for (+)
Verify code before pressing the last #.
"Code error", don't try again!!
"Phone restrictions off", it's unlocked!
Click Here If Code Gives No Response/No Message
Click on banner for 24/7 unlocking

 

Still came up with "incorrect code". I won't try again -Thanks for the offers of help.