It’s no secret that 28 Years Later used iPhones to shoot parts of the film. Now its director, Danny Boyle, has discussed the use of iPhones for the film in more detail with IGN. The first film in the franchise, 28 Days Later, was shot on digital video, giving it a homemade feel. Boyle explained that he and writer Alex Garland got the idea from the fact that home video cameras were common at the time, and people would’ve shot videos with them if an apocalypse had indeed happened. Those cameras, of course, have since been replaced by smartphones.
Källa: ’28 Years Later’ used 20 iPhones in tandem for some wild shots