How do i block a phone number on my Sony Ericsson k550i mobile phone?

scotty asked: I want to block a phone number that keeps ringing me on my mobile.Ive looked online and others are getting calls from same number.They say its a scam..Ime on the 02 pay as you go tariff.Uk. Phone Cards

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How do i block a phone number on my Sony Ericsson k550i mobile phone?