Data services for mobile, starting with SMS text messages.
2G technologies enabled the various networks to provide services such as text messages, picture messages, and MMS (multimedia messages).
After 2G was launched, the previous mobile wireless network systems were retroactively dubbed 1G. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. Both systems use digital signaling to connect the radio towers (which listen to the devices) to the rest of the mobile system.
The name usually given to original GSM, CDMA, and TDMA networks. It uses the spectrum more efficiently than analog (1G) systems and offers digital encryption of conversations. 2 G networks introduced data services for mobiles starting with SMS.
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