Hi @Shao, the PIN code (Personal Unblocking Key) is a 4-digit numeric code and is strictly personal and customizable and is requested by the mobile phone when it is switched on. After entering the PIN code incorrectly 3 times in a row, the PUK (Personal Unblocking Key) code is requested, which you can find on the ho. app, on the personal area of the site, or by calling 800 688 788. Below is the link with all the information on the PIN and PUK code: https://supporto.ho-mobile.it/t5/Soluzioni-per-usare-la-SIM/Codici-PIN-e-PUK/ta-p/13 Good evening.