The SIM card from a phone probably wouldn't work in the SIM slot. The SIM slot is for WWAN (mobile broadband) such as you used to see for USB 3G modems. Phones are typically provisioned differently with different options on the provider side which could prevent a phone SIM card from working properly in the SIM slot.
The following document discussing the WWAN function of the notebook. You will need to contact a provider and activate the service to get a SIM card for it.
