My girlfriend is upgrading, and giving me her new phone, a sony m600i as she doesnt want a new one at present, however she is on Vodafone, and Im on Orange. As it's quite new, how easy is it to unlock? Can i go to one of these high street places that unlocks phones, or am I better off getting her to contact Vodafone to get it unlocked? Never done this before so sorry for dumb questions. Sim.