The PUK (pin unlock key) code is usually printed on the Back of the Tata Docomo SIM pack check it out and if it isn't there then u need to call your carrier and they will give to to you after verification. Make sure not to enter the PUK code your self after 10 incorrect attempts the Sim will be permanently blocked and then u'll need to get a new one!
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Call your carrier. They can provide it for you.
It's Simple...You can get that from Your Service provider..................
u cud get et frum ur provder thing kk