From a corporate standpoint, Sprint recommends that the highest you go with the Fusic is the 1GB card, because it can cause potential problems. But that also depends on the specific card and how it was programmed to store muisc and pictures and so on. I have seen trougle with other phones have the 2GB card. The new Samsung Upstage (which isn't on the market yet but coming soon!) supports the 2GB card but thats the only phone I know of so far made by Sprint that does.