Not sure if anyone else has been affected by this but I'm on VFNZ and am over in Aussie - have been unable to connect to Vodafone Australia since around midday 25th Dec. Neither have 2 others with me. VFNZ say there is a global problem with roaming at the moment however have no estimate for resolution!!
Pretty unbelievable stuff really - I've never known of a network to be unavailable for this long.