That slot is an ExpressCard Slot for WWAN cards that require a sim card in order to
connect to the provider's network. Not all WWAN cards require sim
cards to connect. If you get an ExpressCard WWAN card, and that card requires a sim to
connect, then usually there will be a place on the card itself to put
the sim. The sim slot in the battery bay is because most mini-cards do
not have room to add the required sim card slot and still fit into the
system.
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