DazT wrote: (snipped) Don't think its a Vodafone issue.
It might be as @newcomerhere has mentioned an iPhone, though s/he has not mentioned whether their phone was previously on the Vodaphone network.
Sometime ago a friend of mine also had a data issue with an iPhone after they migrated to another network. It turned out to be a Vodaphone profile file that was preventing the data from working. Once I found this folder, deleted it, the phones data started to work with their new network provider.
For any future readers, it's a separate file and has nothing to do with any APN settings/folders/files.
If newcomerhere's iPhone has never been on the V/phone network, they may still have an issue, which would either be sim card related or a tweak needed at PN's end.