How to unlock GSM phones?

I have a GSM Nokia 3600 smartphone. Today my sister’s son came to my home. He is only 4 years old. He took my GSM Nokia 3600 smartphone and pushed some button. I do not know what he has pushed, my GSM Nokia 3600 smartphone gets locked. Is there anyone who knows How to unlock GSM Nokia 3600 smartphone on my own without showing it to technician?

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