We all have seen these symbols on our cell phone screen while surfing the internet. Without going into details, I will try to explain what these symbols signify.
2G= GSM(Global System for Mobile Communications)
Speed: 14.4 kbps/sec
G= GPRS(General Packet Radio Service)
Speed: 53.6 kbps/sec
E= EDGE(Enhanced Data Rates for GSM Evolution)
Speed: 217.6 kbps/sec
3G= UTMS(Universal Mobile Telecommunications System)
Speed: 384 kbps/sec
H= HSPA(High Speed Packet Access)
Speed: 7.3 mbps/sec
H+= HSPA(Evolved High Speed Packet Access)
Speed: 14.4 mbps/sec
4G LTE= Long Term Evolution
Speed: 100 mbps/sec
4G LTE A= Long Term Evolution Advanced
Speed: 1 gbps/sec