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T400 AT&T WWAN question

Update:11-30Source: network consolidation
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I know this has been discussed already, but my searches couldn't find the info I needed.
I have a T400 6475-B14 and I would like to be able to use it with an AT&T SIM.
However I'm not sure if I need to install new hardware, or if my machine already has what I need.  It's still under warranty and I'm pretty sure that the WWAN card is not a CRU.
With the battery removed it shows the "Y" WWAN symbol and the SIM card slot (with blank) is there, but there are different threads that say different things regarding the WWAN hardware.  I've tried looking on the Lenovo site, but I don't seem to be able to find what the right info.
Can anyone point me to definitive information on this?
Thanks for any/all info!
GBA

The Best Answer

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the simplest to identify whether you have a wwan card, is to actually removed the keyboard, and see whether the mini pci-express slot under the Fn key location is occupied.
http://www-307.ibm.com/pc/support/site.wss/MIGR-70069.html
the above is the hardware manual that shows you how to remove the keyboard.
http://www-307.ibm.com/pc/support/site.wss/MIGR-70069.html
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft
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