After the K3565-Z, which Vodafone sold until yesterday, has apparently been sold out in their online shop, they now offer the HSUPA-capable K3765-HV (produced by Huawei) for the same price and it's unlocked. You just need to run a dashboard update in order to replace the Vodafone software by Huawei's Mobile Partner:
Huawei K3765-HV (Vodafone) - 3G modem wiki)