32-years ago this week on November 12th 1985 trials began of the Linkline 0800 and 0345 numbers.

Later the name changed from Linkline to Freefone (0800) and Lo-Call (0345). An International 0800 services was opened from the United States.

[Read more: How to make an international call]

But how well do you know dialling codes? Take our quiz and find out.



Visit BT Archives to find out more about BT's heritage, including historical phone books.