(under the same cover as the micro SD slot) and try inserting a Simm card (it fits perfectly)... Without first carefully looking into the slot... Well. DON'T. a crazy person I know did that. And the Acer A500 goobled the simm card up like a mother-in-law drinking your good scotch. It'll be gone. The simm card that is. Clearly the slot is there for future use and taped over for a good reason. However, I'm here to report that there is plenty of space inside the tablet for a simm card to rattle around in.