How to enable security of your sim card ??????

When you buy a new sim card you will get a default pin number say for example 1234 or 0000 ( may vary according to the operator).

put your sim card in to your phone go to settings > sim setting > enable pin , there you enter the defult pin number , and your phone will ask you to enter the pin number you want to set. enter it twice . then it will set, to check if it is working or not , re-start your cell phone , so automatically the phone ask you to enter pin number if correct pin is entered , it will enable the network service.

if you enter the wrong PIN more than 3 times the sim will automatically switch to PUK which helps to change the pin no. if you enter wrong PUK number more than 3 times the sim card will self destruct its circut's to avoid further entries and misuse , in case if you forget the PUK number you can contact your customer care to get a PUK number.

Before that you have to note down your sim card number , it will be printed on the back side of the Sim card, now call the customer operator from another phone. Tell them what happend they will ask you more detils to know that you are the real owner of the sim card. Once that is clear, they will give you the PUK number, enter that number to phone and the phone will ask you to enter the new pin number twice then it will all set. If you put you card in other phone the phone will ask to enter pin number of the inserted sim.

This allows you to save your sim card's from misuse..... Thats all..........

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