Public payphones are disappearing everywhere in the mobile era, and of the some 47,000 phone kiosks remaining on British streets, fewer than 11,000 are that iconic, classic red phone box.
The two most popular variations of this British classic were designed in the 1920s and 30s by Sir Giles Gilbert Scott—same bloke who did the Bankside power station that now houses the Tate Modern. Its design and domed top were supposedly inspired by Sir John Soane's tomb in the yard at St Pancras Old Church.
More on phone kiosks (and those blue, Doctor Who police boxes): The-telephone-box.co.uk