Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_3 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7E18 Safari/528.16)
Also I think each 3G ipad will have an app or something in the settings to turn the service. There is no guarantee that EU carriers will offer service without a contract. But the short of it is a 3g ipad will work with any carrier that supports micro SIM and the bands the ipad supports.