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Launched by Nippon Telegraph and Telephone. Motorala was the first one to produce it their weighed 2 pounds, the Motorola DynaTAC provided 30 minutes of talk time and took roughly 10 hours to charge. It was pretty crappy for todays standards, it was awkward to use and quality wasn't very good.
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It was launched under the GSM standard in Finland. It was the first time calls could be encrypted, text messages, images could be sent, and calls were significantly clearer. By the end of the era, speeds of 40 kbit/s were achievable and EDGE connections offered speeds of up to 500 kbit/s.
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3G was launched by NTT DoCoMo in 2001 and aimed to standardize the network protocol used by vendors. It was four times faster than 2G. The blackberry was realized in 2002 and the iPhone in 2007. The network capabilities were about to get crazy.
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4G was first deployed in Stockholm, Sweden and Oslo, Norway in 2009 as the Long Term Evolution (LTE) 4G standard. It could stream 1GB per second. Could stream HD and was a good system. Phones had to be switched over manually, making it so companies could advertise it. It's what helped Apple be a trillion dollar company.
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It was created by NASA in 2012 to better support the internet because 4G was pretty spotty and couldn't support the large networks. It's pretty fast and works well but will soon probably be phased out by 6G. https://www.brainbridge.be/news/from-1g-to-5g-a-brief-history-of-the-evolution-of-mobile-standards#:~:text=The%20second%20generation%20of%20mobile,standard%20in%20Finland%20in%201991.&text=For%20the%20first%20time%2C%20people,digital%20future%20presented%20by%202G. Used as my main website.