First cell phone 1973 large commercial mobile
phone, first flip type mobile phone, 1G system, Nordic Mobile
Telephone was introduced in 1981, first 2g second generation
cell phone 1991, digital vs. analog first phone to phone text
1993, 1994 Simon smartphone could fax had stylus, touchscreen
color screen (never became a success).
In 1999, the Japanese firm NTT Docomo released the first
smartphones to achieve mass adoption within a country, 2001
first 3g phone, 2007
first touch screen smartphone, 2009 first 4g
phones. 5G phone development has yet to begin, but should arrive
by 2020.
2g, 3g, etc., is for generation, and LTE is for Long Term
Evolution (a specific type of 4g).