that means that there is likly support for sdio serial cards in the sharp rom, however it has never been tested
it would also mean that SDIO gsm/gprs cards (if the exsist) that use serial emulation as a communications link will work and also any bluetooth module that uses serial to communicate will work in theory
note the IN THEORY[/] part of the post there as it has never been tested, i am in no way endorsing you to buy such products and all such purchases should be wighed against the potetntiol for not working