What's the slot under the battery

Just received my new T400 yesterday, and was very excited about it.
have one question here.  I noticed a place where the battery seven mental pins touch the laptop, under that place, there is a small plastic film with a board card with size similar to a micro-sd card. It has a figure also looks like a SD card (rectange with one corner cut). If I pull the plastic film, the card can also be pulled out, but the film stays in.
I can not find this anywhere in the manual. What is that slot suppose to do? I assume it's not the SD card reader, since it's on the left side of the laptop, not hide under where the battery fit in.
Thanks.
T400 2764CT VISTA
Solved!
Go to Solution.

I recently bought  a new T400 laptop serial number * and model number 6474V86, I have the SIM card slot but I don't know if I have the WWAN available in my laptop or not.
How can I check if I have this service on my laptop or not?
Moderator edit: Masked serial number to prevent anyone else from mis-using it.

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