This evening I remember that I had a 4GB Micro SD card around somewhere at home. Found it, inserted, formatted and transferred data from the 'old' 2GB unit that came with the phone. Now - am I imagining things, but the phone seems to be running a bit faster. I think the card I inserted is a class 2. Now if a class 2 performs like this, the class 6 cards must take it to a new level of improved speed. If it's not the class of card, is it the capacity that influences speed? How exactly does the read/write speed influence the general workings/speed/process of the phone?