The mobile phone has come a long way since its invention in 1973. Early mobile phones were large and bulky, but designs shrank over time, pioneering the flip phone form. The first mass produced phone was the Nokia 1011 in 1994. Smart phones launched with the IBM Simon in 1994, allowing additional functions. The iPhone launched in 2007 and popularized touchscreen-only designs, sparking many "iPhone killers." Future concepts propose foldable screens, but the next breakthrough in mobile phone design remains unknown.