Hi Adamaris, Thanks for contacting us, PUK (Personal Unlocking Key) is a security feature on mobile phones that protects your SIM card data. PUK code is unique to your SIM card and is required when a SIM Card PIN code entered incorrectly multiple times. Unlocking a SIM card with a PUK differs from Network Unlocking. For PUK Code please contact your SIM Network Service Provider, They provide you your PUK Code. Regards Customer Support www.freesimunlocker.com