Hi Light Sight
well, depending on your laptop built,
as far as I know, some has
WWAN - Like a 4G Modem, if it is not installed, you can use it, and else it it is installed, you will need to sacrifice it for it)
else you need speed, etc, you can consider for SATA SSD for it.
the wireless for WWAN and WIFI is a different hardware
look on the link provided below
http://www.storagereview.com/lenovo_thinkpad_x220_review
Take Pictures of that area .... on the mSATA/WWAN slot location to confirm
[image|1336021]