What is the telephone "city code 704" used for in the UK?

I live in Canada and have been trying to get a hold of a friend in the UK with the city code 704 but every telephone company here tells me that they are not allowed to dial a 704 number. Why?

FYI – I have gone through Telus, Rogers, and Primus and all gave me similar answers. Saying, it is a 800 number, or "The telephone system must be down in the UK…" The phone number is legit as I have gotten through a couple of times, only to be cut off via a British operator. Saying, the number cannot be completed as dialed. Now I cannot get through at all.

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