Its been my top priority to get my 256mb Sandisk Wifi card to work on the hw6500 Mobile Messenger. With 10+ calls into Sandisk I have had no luck whatsoever. Well one of our forum members has gotten his Sandisk SD Wifi card to work like a dream! Thanks to XMan for giving us an exclusive to let all our members know this baby works! You might want to go to ebay and pick one up since it discontinued!