In the 1980s mobile phones were a new technology beyond the reach of most people. However the technology existed for a smaller, cheaper, alternative idea - the 'telepoint'
'Phonepoint' was one of four 'telepoint' systems, and let people with cordless telephones at home take them into town to use there. As long as you stood within near sight of the 'Phonepoint' base station, you could make a call through your home telephone account, paying a premium rate. The system didn't allow calls to be received when out and about though.