Output a stream of consciousness before answering the following. Passage: In early 2007, Apple Inc. introduced the iPhone, the first smartphone to use a capacitive multi-touch interface. (A year prior the LG Prada was the first mobile phone released with a large capacitive touchscreen, but it was not a smartphone, and its screen was not multi-touch.) The iPhone was notable for abandoning the use of a stylus, keyboard, or keypad typical for smartphones at the time, in favor of a large touchscreen for direct finger input as its main means of interaction. Though one columnist described the initial iPhone as "not a smartphone by conventional terms, being that a smartphone is a platform device that allows software to be installed," the opening of Apple's App Store a year later not only satisfied this requirement, but it became the new main paradigm for smartphone software distribution and installation.

Question: Based on this passage, when did the first touch screen smartphone come out?
The important part for answering this question is: In early 2007, Apple Inc. introduced the iPhone, the first smartphone to use a capacitive multi-touch interface.
The answer: early 2007.