“For most of the 20th century, the landline was the only phone around. With the mobile you’re always available, so it’s the number most of us dial first.
So it is perhaps not surprising that a directory service is starting up that allows people to find out someone else’s mobile phone number in the same way we’ve always been able to do for landlines.”
An excellent video from the BBC explaining exactly how this service works.
Thanks to my mum, who was a BT telephonist in the early days of her career, for discovery :)