I can’t unlock Nokia 5230 when i turn on

My phone locked when i turn on. I can’t unlock. I press unlock button but nothing happened. Phone still locked.
Answer #1
My phone locked when i turn on. I can't unlock. I press unlock button but nothing happened. Phone still locked.try removing the battery, then cleaning the contacts of the battery with a dry paper towel, then put the battery back in, and try it again. the unlock code should be 12345
Answer #2
You don’t understand. I can’t unlock the keys with unlock button. I don’t have mobile network too.
EDIT:
It works now.
Answer #3
Button it’s not working again. I can’t unlock keys.
Answer #4
Try to reinstall the software or format your phone..
Answer #5
Well a bit of searching and you aren’t the only one with this problem:
someone reported:
I had the same problem but just plugged in the charger and then connected to the computer. To my surprise it went straight into PC suite, where I backed up the messages but not the settings, but by the end of that I realised it was working again.