How to unlock my iphone 4 with a different computer?

I went out for tea with my family and put a password on my iphone because i didn't want my younger siblings to mess with it.
After dinner i went to use my iphone and it was locked!
How can i unlock it since i don't have the computer i used to register it?

Open the gate then open the window and on the wall write unlock.

You can try this: press emergency call, dial ###, call it and quickly press the lock button… It should glitch and get by the lock code

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