4S locked by code, how do I?

Hello,
I found an iPhone 4S on a bench. The phone is locked by code. It is also in airplane mode.
How can I unlock it to then unlock and then use it?
Thank you for your answers.
niko

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here's how to do it:

• Get a usb cable for iphones
• Install iTunes
• Plug the iphone into your computer
• Hold down the home button and top button - the phone will turn off
• Continue holding both buttons
• Tap the home button while still holding the top button to restart the phone - continue holding both down
• The iTunes logo should appear on the phone
• An option to restore the phone to factory default should come up in itunes.
• Restore the phone - it will erase everything.

Hello,
Try connecting your iPhone to a PC and you go on iTunes. Once the iPhone plugged in, switch off the device, press Home and the top button. Press the home button while holding the top button to reboot the phone and keep the two down : the logo of iTunes should appear on the phone with an option for restaurant the phone in iTunes.