I got the Sony Ericsson w380a phone a week or so ago and it came with a free 512mb Memory Stick Micro (M2). I want to expand the memory and the box says its only expandable to 2gb. Now, when I search up on the web for a M2 memory card, I see some people selling 4gb and 8gb cards and they say that its fully compatible with my SE w380a. I need to know who is right and who is wrong before I end up buying a card that is not compatible for my phone.