My iphone 4 will no longer accept my PIN

Hi! I have had my iphone 4 inactive for some months as I have changed phone. Now I want to hand it over to my son. First, I couldn't make it accept my own PIN-code. Trying to use my son's brand new SIM-card, it will not accept that code either. What is wrong and what can I do?
a.

What PIN code, are you referring to the Unlock screen?  That will only accept the security code that was setup by the user and has NO bearring on the SIM card installed in the device.
If you have forgotten the unlock code, restore the device either via backup from the computer it normally syncs with or as new from any computer with iTunes.
If you are referring to the SIM unlock PIN code, enter the correct code or get a new SIM from the carrier.

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