Editing 2G (section)

=== 2.75G (EDGE) ===
{{Main|EDGE (telecommunication)}}
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2.75G refers to the evolution of GPRS networks into [[Enhanced Data rates for GSM Evolution|EDGE]] (Enhanced Data Rates for GSM Evolution) networks, achieved through the introduction of 8PSK (8 Phase Shift Keying) encoding. While the symbol rate remained constant at 270.833 samples per second, the use of 8PSK allowed each symbol to carry three bits instead of one, significantly increasing data transmission efficiency. Enhanced Data Rates for GSM Evolution (EDGE), also known as Enhanced GPRS (EGPRS) or IMT Single Carrier (IMT-SC), is a backward-compatible digital mobile phone technology built as an extension to standard GSM. First deployed in 2003 by AT&T in the United States, EDGE offers a theoretical maximum transfer speed of 384 kbit/s (48 kB/s).<ref name=":1">{{cite web |url=https://www.3gpp.org/technologies/keywords-acronyms/102-gprs-edge |title=GPRS & EDGE |website=3gpp.org |access-date=2019-08-17 |archive-date=2020-04-17 |archive-url=https://web.archive.org/web/20200417193611/https://www.3gpp.org/technologies/keywords-acronyms/102-gprs-edge |url-status=live}}</ref>