I asking any one use a 1 gig card in the zx20. what the resalts the rep said do not go bigger the 512 because if you start to max out the 1 gig it will give you phone lag times and other problem and that why we stop making card at 512. are they just saying it so you do not buy a 1 gig card because they do not make it or are they right and it will bog down the OS and phone if you know let me know so i can get the card soon. i really want the 1 gig but if it troble on the phone i get the 512 instead. i waiting to buy the card till i find out from someone other then the Samson's rep.