Those Vodafone 3G sticks produced by Huawei can easily be unlocked if they actually are locked. Usually the back of the box or the stick itself shows the manufacturer's logo (Huawei or ZTE).
Here in Germany Vodafone modems have always been sold unlocked (even prepaid ones). Only the dashboard software on these refuse to connect to other networks. However you can replace this restricted dashboard software by an unlocked one through a simple update procedure (see
3G modem wiki Home - 3G modem wiki for more details).