<P> In March 1996, Hewlett - Packard released the OmniGo 700LX, a modified HP 200LX palmtop PC with a Nokia 2110 mobile phone piggybacked onto it and ROM - based software to support it . It had a 640 × 200 resolution CGA compatible four - shade gray - scale LCD screen and could be used to place and receive calls, and to create and receive text messages, emails and faxes . It was also 100% DOS 5.0 compatible, allowing it to run thousands of existing software titles, including early versions of Windows . </P> <P> In August 1996, Nokia released the Nokia 9000 Communicator, a digital cellular PDA based on the Nokia 2110 with an integrated system based on the PEN / GEOS 3.0 operating system from Geoworks . The two components were attached by a hinge in what became known as a clamshell design, with the display above and a physical QWERTY keyboard below . The PDA provided e-mail; calendar, address book, calculator and notebook applications; text - based Web browsing; and could send and receive faxes . When closed, the device could be used as a digital cellular telephone . </P> <P> In June 1999 Qualcomm released the "pdQ Smartphone", a CDMA digital PCS smartphone with an integrated Palm PDA and Internet connectivity . </P> <P> Subsequent landmark devices included: </P>

When did the first smart phones come out