SIM card when the purchase was attached to a rectangular piece of plastic. On this plastic under and over the scratch-off area of the written word: PIN1, PIN 2, PUK1, PUK2. Fingernail or the edge of a coin scratch off the area under the word PIN1.
Factory default PIN1code can consist of digits is 0000, 1234, or such simple combinations of digits. Enter as a codeand one of these combinations.
In case of changing the factory PINcodeand more complex to write it down in a place where no one can read. In no case do not store code along with the phone. In the best case do not burn, and remember the code.
If you are not the formal owner, contact him and find out all codes phone. Replace them and write down in a safe place new codes.