UMTS Card Reader ?

Here is a link to the service and user manual on your laptop.

http://support.dell.com/support/edocs/systems/latd620/en/index.htm

See if it helps.

Also, are you sure your laptop was ordered with a Vodafone card in it?
Dell included the SIM slot even if you don't have a HSDPA/UMTS card.

You can also go into the BIOS and look at the device summary, there should be an area that says something like "Cellular: Installed"

indian SIM Card GSM & CDMA not working in D620 Latitude

Sanjeev Pareek