As it's Vodafone, do you have a network unlocked device?
If not then you can't use HTCDev.com and must wait for the general s-off tool.
Alternatively you can try to network unlock your device, through Vodafone or third party.
Phone: Samsung Galaxy Nexus
Rom: Codename Lungo
Phone History: Nokia 6300, HTC Desire, Sony Xperia S, HTC One S