If you're referring to transfering the data from the 2 GB to the 6 GB card, the best way is to use a PC. Create a folder on your PC. Plug your BlackBerry to your PC and copy all files and folders to the folder you just created on your PC. Unplug your BlackBerry from your PC. Take the 2 GB card out of your BlackBerry, and replace it with the 6 GB card. Plug your BlackBerry to your PC once again. Copy all files and folders from the folder you previously created on your PC, and transfer them to the new 6 GB card.
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