How to transfer contacts from BlackBerry to iPhone: method 1
The prescribed way to transfer contacts from older BlackBerry handsets is to use the
BlackBerry Desktop software app. Simply connect your BlackBerry to your PC and start the BlackBerry Desktop software. Go to Device, Backup, and back up your phone - making sure that the Contacts are being backed up.
Now that your Contacts are on your PC, simply connect your iPhone and launch iTunes. Just below the main playback information window. Select 'Info', and then tick the box next to 'Sync Contacts'. The next time you sync your iPhone on that PC your contacts will sync with your iPhone.