Yes am agree with Ragu, You should claim of your warranty, If it is not then you should use unlocking softwares to do this. You may check these websites: http://www.gsmliberty.net/shop/cell-phone-unlocking-c-21.html http://mobile-phones.com.pk/softwares/Utilities/My-Keylock-v.1.1.7-Lock-and-Unlock-q6363
Don't use any software to unlock it always affect our mobile software The best way to unlock your mobile using codes If you want to unlock get the code from this site http://www.theunlockspot.com and follow the instructions to unlock and the cost also free in this site
You have to show to the customer care or otherwise you have to format your phone.Please use a code 12345 or 0000 type code,hope it may unlock.