MMCmobile is a type of memory card based on RS-MMC.
MMCmobile memory cards combine the small size of RS-MMC with the high speed of MMCplus.
Physically, they appear identical to RS-MMC. They will fit in an RS-MMC slot and are compatible with all RS-MMC devices.
More importantly, MMCmobile cards are dual-voltage, meaning they will work with older phones with a high-voltage (3v) RS-MMC slot, as well as newer Nokia phones with a low-voltage (1.8v) RS-MMC slot.