L502x sim card slot

How can i know there is the chip inside it?

You'd know because it is an OPTIONAL part and you would have had to pay an extra $125+ for it.

That's how you know.

i make lot of search and drivers download and finally i found the answer myself..

1.u need to buy WWAN Card like the 1st image..

2.and connect the card to u'r laptop WWAN slot like 2nd image

3.and remove u'r battery. connect u'r sim card in the sim card slot..

4.install the 5540 hspa mini card driver http://www.dell.com/support/drivers/us/en/19/DriverDetails/Product/xps-l502x?driverId=WGVYG&osCode=ww1&fileId=2935061607&languageCode=en&categoryId=CM

5.dell mobile manager http://www.dell.com/support/drivers/us/en/19/DriverDetails/Product/xps-l502x?driverId=38NT1&osCode=ww1&fileId=2935034914&languageCode=en&categoryId=AP

But in this case needs an antenna 3g too right. I thought about putting two of these:

http://www.ebay.com/itm/New-Antenna-for-Wireless-3G-HSDPA-HSUPA-GPS-WWAN-Full-PCi-e-Express-Card-Module/300713068809?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D24902%26meid%3D1fb6fa3e71f24dce87cfaaab697d1247%26pid%3D100033%26prg%3D10502%26rk%3D2%26rkt%3D4%26sd%3D301203789233

or will it work only with the original dell staying at the back of the LCD screen (which is not installed on my DELL XPS L502X)

http://www.ebay.com/itm/New-Genuine-Dell-XPS-L501X-L502X-Lcd-Back-Cover-Lid-Top-W-hinges-RXF67/321459381763?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D24902%26meid%3Db7a72fd684f14a8ca886a1d969781d78%26pid%3D100033%26prg%3D10502%26rk%3D2%26rkt%3D4%26sd%3D300713068809

tanks