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Most smartphones can access the Internet and can run third-party software components ("apps").They typically have a color graphical user interface screen that covers 70% or more of the front surface, with an LCD, OLED, AMOLED, LED, or similar screen; the screen is often a touchscreen.

They were installed at Peoples' Telephone Company in Leesburg, Alabama and were demonstrated to several telephone companies.

The original and historic working models are still in the possession of Paraskevakos.

The first mobile phone to incorporate PDA features was an IBM prototype developed in 1992 and demonstrated that year at the COMDEX computer industry trade show.

In the third quarter of 2012, one billion smartphones were in use worldwide.

Devices that combined telephony and computing were first conceptualized by Nikola Tesla in 1909 and Theodore Paraskevakos in 1971 and patented in 1974, and were offered for sale beginning in 1993.

Paraskevakos was the first to introduce the concepts of intelligence, data processing and visual display screens into telephones.

In 1971, while he was working with Boeing in Huntsville, Alabama, Paraskevakos demonstrated a transmitter and receiver that provided additional ways to communicate with remote equipment, however it did not yet have general purpose PDA applications in a wireless device typical of smartphones.

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