According to this thread at VM:
It looks like national roaming is set to work on Virgin Mobiles now. "National Roaming" is not yet being rolled out for all, however trials are going on and it will be rolled out soon. You can call Virgin on 789 and ask for "national roaming" to be activated for your mobile, you should then be able to use the Orange network through your Virgin sim.Code:You need to register to see links. Register.