PIN stands for Personal Identification Number. A PIN code is a numeric value used in certain systems as a password to gain access, and authenticate.
In mobile phones a PIN code locks the SIM card until you enter the correct code. Each mobile phone network sets the PIN number of their SIM cards to a standard default SIM number (you can change this via your handset if you wish, but make sure you don't forget the new code). This protects your account, even if your SIM card is insert into another mobile phone.
That means, if you enable PIN protection on your handset, you will need to enter the PIN code each time you switch your mobile on. If you enter the PIN code incorrectly into the phone 3 times in a row, then the SIM card will be blocked and you will require a PUK code from your network/service provider.
(SIM) PIN code 2
The PIN code 2 are deliverd with the new SIM cards (GSM phase II ). This code controls access to some of the more advanced features of the phone (f.ex. fixed dialling list a restricted list of numbers the phone can call: handy if you lend a phone to kid) . The default code is set by the Service Provider, but you are able to change this code.
PUK stands for Personal Unblocking Key. If you have entered you're PIN code incorrectly 3 times your sim card will be blocked and you will be unable to make and receive calls/texts. You will need to obtain the PUK code from your network provider, or you will need to consult your GSM cell phone manual. Caution: if the PIN code is entered 10 times incorrectly, the card is permantly disabled and the SIM card has to be exchanged.
PUK code 2
This performs the same function as the PUK, but for SIM PIN 2. You should ask your Service Provider for this code when you need it.
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