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The first integration of data signals with telephony was conceptualized by Nikola Tesla in 1909 and pioneered by Theodore Paraskevakos beginning in 1968 with his work on transmission of electronic data through telephone lines.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.Limited functionality, small screens and limited bandwidth allowed for phones to use the slower data speeds available.

It was also 100% DOS 5.0 compatible, allowing it to run thousands of existing software titles, including early versions of Windows.The results were devices that were bulkier than either dedicated mobile phones or PDAs, but allowed a limited amount of cellular Internet access.The trend at the time, however, that manufacturers competed on in both mobile phones and PDAs was to make devices smaller and slimmer.This formed the original basis for what is now known as caller ID.The first caller ID equipment was installed at Peoples' Telephone Company in Leesburg, Alabama and was demonstrated to several telephone companies.

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