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Hi i think your samsung c3303 mobile is locked to network ...Due to this if you enter other network sim in it ..It wont work with it unless you unlock it .If you want to unlock your samsung c3303 mobile from network lock then you can use online providers like Theunlockarena.com who render unlock code for all mobile models at affordable ..Even after unlocking it if it shows same message then you can better contact your service provider.
you can obtain the puk code from the customer care of your sim..
or you can go to any mobile dealer and tell them the problem they will provide you the puk code..
do not unnecessarily try to enter invalids puk code..
this may even block your sim card permanently.
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