There are bluetooth based storage devices based on bluetooth network. But they are expensive.
AFAIK , most of the cellphones and tablets only have USB port for wired connectivity. ANd for using them you must have a device with USB OTG suppport. You can have custom kernels that may add this feature.
Plus you may even need the Y jack , to use external power bank in order to power you memory devices.
So without OTG , I wonder what mechanism you plan to use , .