I'm thinking of doing this, but (sorry if I sound stupid) the phone was brand new to me locked to Vodafone. Vodafone unlocked it for me (I now use GiffGaff). If I jailbreak, will my phone be locked back to Vodafone?
since it was officially unlocked by voda you dont need to worry about it ever locking up again, though if unlocked with ultrasn0w it would lock by upgrading in itunes, not jailbreaking