I have bought a 16 GB SD card to replace the 8 GB one that comes with the phone and I would like to know if the folders contained on the card in the phone are important and if they need to be copied onto the new card , some of the folders are empty but some of them are over 1GB in size does anyone know what these folders are for, when I saw the phone came with an 8GB SD card I thought that I would have all that space for media files and I was quite surprised to find so much of the card taken up by other stuff.