2G en · ADJ
Meanings
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(retronym) Referring to standards before 2.5G. Includes GSM, DMA, TDMA, iDEN, and PDC.
The entire rail network has long operated its own masts, used for communicating with drivers. But they are largely GSM. That's 2G to us -yesterday's tech.
2025 October 1, Paul Clifton, “Reaching out for superfast WiFi”, in RAIL, number 1045, page 50:
Hyponyms
IS-95 · GSM · JDC · D-AMPS · IS-136 · PDC · iDEN · cdmaOne