Usually, nasa network settings yan, specifically sa SIM settings or sa Phone Call>Setting>under SIM 1 or 2>More, then ang default SIM PIN codes nyan is 1234 both PIN 1 & 2. Provided that in possession mo pa yung SIM bed. No worries, if anything goes wrong with your codes – you can request for PUK codes on your network provider after security check verification, i.e., name, or load balance.