Do you used spy call without beep in your mobile?

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hey guys and gals i really like my mobile a lot.i am using nokia 6630,which has best got feature to install sis and jar file and has faster operation OS.but the most uique feature of my mobile i used a spy call where there is no beep sound at all.So i used to record all the call i made and received and make of fun of it....No one can tell any lies on phone to me because i can show them the proof in voice what they talk to me..