How to tranfer contact from BB to iphone?

May I have a help please how to transfer contacts from BlackBerry to iPhone?

You'r welcome:

http://www.everythingicafe.com/transfer-contacts-calendars-blackberry-iphone/2012/05/01/

http://www.infoworld.com/d/mobile-technology/bye-bye-blackberry-how-transfer-your-contacts-iphone-or-android-193581

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