There is a still for the Rabbit mobile phone service (the predecessor to Orange) at Watford Junction in the waiting room on platform 7/8. The service was founded in 1992 and then defunct by 1993!
https://commons.wikimedia.org/wiki/File:Rabbit_point_Watford_Junction.jpeg
https://commons.wikimedia.org/wiki/File:Rabbit_point_Watford_Junction.jpeg