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The Gobi is a card that can do both CDMA and GSM by loading different firmware on the fly to the card. GSM based protocols use SIM cards whereas most CDMA networks do not use as SIM.
CDMA is used primarily in the US, Australia and Japan, with the rest of the world (other than China, they have there own protocols) use GSM however both types of networks may be in a particular country (for example in the US AT&T/Cingular is a GSM based network).
Now I don't know if the card in the SG is a gobi 1000 or 2000 and if iRex have supplied the firmware for qserial to load the GSM firmware though I expect they have as there is a slot for a SIM.
WCDMA is not used in europe, that I know of.
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