This person spent 71 minutes on hold and was charged £18,000

OK this is an opportunistic post as mobile data when abroad can catch anyone out, but we do actually try to get you speaking to a human inside 3 rings. It should be a human whose name you know. They should also know who you are before they answer the phone. We are remarkable like that.

It's really important you tell us if you plan to go abroad with a mobile phone before you leave though, this is a real issue.