Its inventors say the costs to run the machine are low -- it requires only basic maintenance such as cleaning , and initial costs of installing each Solarbox is forecast to be recouped within three months . London 's red phone boxes are being turned into a solar - powered phone number boxes . The design teams are behind the idea , which is being rolled out across the city . It 's not the first time traditional phone boxes have been given a modern way of life . Others have been turned into chairs , sofas and shower ##s .
London 's red phone boxes are being turned into a solar - powered phone number boxes . The design teams are behind the idea , which is being rolled out across the city . It 's not the first time traditional phone boxes have been given a modern way of life . Others have been turned into chairs , sofas and shower ##s .