<Li> The Kyocera 6035 (early 2001), a dual - nature device with a separate Palm OS PDA operating system and CDMA mobile phone firmware . It supported limited Web browsing with the PDA software treating the phone hardware as an attached modem . </Li> <Li> Handspring's Treo 180 (2002), the first smartphone that fully integrated the Palm OS on a GSM mobile phone having telephony, SMS messaging and Internet access built in to the OS . The 180 model had a thumb - type keyboard and the 180g version had a Graffiti handwriting recognition area, instead . </Li> <P> In 1999, the Japanese firm NTT DoCoMo released the first smartphones to achieve mass adoption within a country . These phones ran on i - mode, which provided data transmission speeds up to 9.6 kbit / s . Unlike future generations of wireless services, NTT DoCoMo's i - mode used cHTML, a language which restricted some aspects of traditional HTML in favor of increasing data speed for the devices . Limited functionality, small screens and limited bandwidth allowed for phones to use the slower data speeds available . The rise of i - mode helped NTT DoCoMo accumulate an estimated 40 million subscribers by the end of 2001 . It was also ranked first in market capitalization in Japan and second globally . This power would later wane in the face of the rise of 3G and new phones with advanced wireless network capabilities . </P> <P> Smartphones were still rare outside of Japan until the introduction of the Danger Hiptop in 2002, which saw moderate success among U.S. consumers as the T - Mobile Sidekick . Later, in the mid-2000s, business users in the U.S. started to adopt devices based on Microsoft's Windows Mobile, and then BlackBerry smartphones from Research In Motion . American users popularized the term "CrackBerry" in 2006 due to the BlackBerry's addictive nature . </P>

When did cell phones first come on the market