James_: Spoke with Vodafone. This is a congestion issue and could be rectified by installing new hardware but they are unwilling to do this as it is expensive and only happens to the network at this time of year. They are just going to ride it out and monitor the congestion, despite the network being unusable since 10pm Christmas Eve and still unusable - well in breach of most SLA agreements. This is a dangerous position for anyone to be in if they need to make an emergency call in Australia - not to mention the effect on business and people staying in touch on holiday.
Unfortunately this will be an easy issue for them to blame on other Networks.
Network is not unstable! international links are congested and thats it. (did you not read the 4th post)
Any SLA agreement would not cover roaming!
Roaming setup invloves many elements beyond VFNZ network control.
This is affecting many carriers around the world.