how to delete duplicate contact lists on BlackBerry Bold 9700 quickly. when you sync both yahoo address and gmail address with your BlackBerry Bold 9700 . you will got a duplicate contact list on your Bold 9700. it is boring to delete each individual contact. there is a way to quickly delete Gmail contact list or Yahoo contact list quickly. From your Bold 9700, go to contact options > then type ” rset” , it will work.