When i answered it, it started ringing as though i'd called them. Someone did pick it up, it was some yank asking me if i was on contract or PAYG. Told him to bugger off, was it a scam or something?
Just found this Pulborough charge group Telephone numbers beginning with 01798 belong to the Pulborough charge group.
I kept getting similar whilst I was in Germany really pissed me off as I was getting hit for a roaming charge every time. I kept the calls short