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How we can block unknown callers???

How we can block unknown callers???

some unknown person call me...

i hate... every one calls me & i don't know

please send me it's soluation How we can block unknown callers???

on Nokia 1200 we can screen no. of unknow person

but i can't see in Nokia 6233

thanks

tell me as soon as possible

plz

at [email protected]