2nd generation is based on digital circuit switched system. Systems provided voice and a limited data capacity of 9.6 to 14.4 Kbps.
Systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system. It is significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels, voice quality compared to 1G System
Introduced of data services for mobile, starting with SMS text messages, regional roaming.