The SIM card is protected against unauthorised use by a secret code of 4 digits. This number is known as the PIN (Personal Identification Number) in English. If you enter this code wrongly 3 times, the SIM card will be automatically blocked. If the SIM card becomes blocked, you will have to enter the PUK code. Your PIN code is shown on the back of your Canarias MÓVIL card, though for your security we recommend that you change it in the telephone options.