How to reset your passcode on the iphone 5?

How do you change your passcode with an iphone 5? My son can't remember his passcode:-)

The only way to change the passcode is to know it, so you can change it. The only work-around is to Restore the iPhone. You will have to put it into Recovery Mode to do this. Here are the easy steps. Open iTunes on computer. Connect iPhone to computer with USB Cable. Hold both Home and Power buttons until iTunes recognizes iPhone in Recovery Mode, usually takes about 20 seconds of holding both buttons. Click the Restore button of iTunes.