Hey Mcav - I have the answer for you
The Nokia 6680 smartphone uses ONLY dual voltage reduced size multi media cards. known as DV RS-MMC cards. These are the only cards which operate at the required frequency.
As for maximum capacity - the Nokia 6680 smartphone will take any size of card, though I do recommend you do not go any higher than a 512MB card - they run fine, but 1GB ones have been known to cause problems. Whether it's coincidental to a faulty handset is unknown.
But there you go - happy buying and hope you enjoy your new phone
Man this is a one man thread!!!!