The PUK code on an LG TracFone is short for PIN Unblocking Key. The PIN is a lock code on the phone’s SIM card. The default SIM PIN code on TracFones is 0000, but the SIM PIN prompt is not enabled by default. It is possible to change the code and activate the feature through the menu. If you forget the code and enter the wrong code too many times, TracFone blocks the SIM card.
