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2. List of wireless network technologies - Wikipedia

   en.wikipedia.org/wiki/List_of_wireless_network...

   2G (or 2-G) provides three primary benefits over their predecessors: phone conversations are digitally encrypted; 2G systems are significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS (Short Message Service) plain text-based messages. 2G technologies enable the various mobile phone ...

3. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   4G: OFDMA: LTE: Digital: 2009 Worldwide SIM card: None Smaller cells and lower coverage on the S band. Very low density Hard No (data only) Voice possible through VoLTE or fallback to 2G/3G 5G: OFDMA: NR: Digital: 2018 Limited SIM card: None Dense cells on millimeter waves. Very low density Hard No (data only) Voice possible through VoNR

4. 2G - Wikipedia

   en.wikipedia.org/wiki/2G

   Later 2G releases in the GSM space, often referred to as 2.5G and 2.75G, include General Packet Radio Service and Enhanced Data Rates for GSM Evolution . GPRS allows 2G networks to achieve a theoretical maximum transfer speed of 40 kbit/s (5 kB/s). EDGE increases this capacity, providing a theoretical maximum transfer speed of 384 kbit/s (48 kB/s).

5. GPRS - Wikipedia

   en.wikipedia.org/wiki/General_Packet_Radio_Service

   Enhanced Data rates for GSM Evolution (EDGE), also known as 2.75G and under various other names, is a 2G digital mobile phone technology for packet switched data transmission. It is a subset of General Packet Radio Service (GPRS) on the GSM network and improves upon it offering speeds close to 3G technology, hence the name 2.75G.

6. LTE (telecommunication) - Wikipedia

   en.wikipedia.org/wiki/LTE_(telecommunication)

   2G (2.5G, 2.75G, 2.9G) 3G ... LTE is also called 3.95G and has been marketed as 4G LTE and Advanced 4G; ... the second commercially available LTE smartphone ...

7. 4G - Wikipedia

   en.wikipedia.org/wiki/4G

   In 4G systems, the circuit-switched infrastructure is abandoned and only a packet-switched network is provided, while 2.5G and 3G systems require both packet-switched and circuit-switched network nodes, i.e. two infrastructures in parallel. This means that in 4G traditional voice calls are replaced by IP telephony.