I have a 8 GB iPhone 3GS. Is it possible to plug in a micro memory card into this to bump up storage space? I see a number of ominous silver rectangles on the top left side of the phone, almost looks like you can open one and slide a memory card into it. But is this actually possible to do on this phone? The booklet/leaflet that came with the phone was not much help. It was as sparse as what you'd get from Ikea to build their furnitures. Thanks for the help.