i also used fake Sony MSPD 2GB for my SE w900i before. My phone always hang until i changed my card to original Sandisk MSPD 4GB (which have sandisk hologram with serial number) and Photo Marketing (M) Sdn Bhd sticker for warranty purpose on the package. It's working fine now.. really fast mspd i ever use. Got no problem afterall... So buy the original!!