- E is edge (also called Enchanced GPRS) which is a enhancement over gsm/gprs (2G) technology. Data rates of around 400kbps. It basically uses gsm/gprs infrastructure.
- 3G is the next major technology which uses WCDMA radio signalling. The data rates here are comparable to edge but It offers better quality, better latency, lower delay, so making it more suitable for audio, video and streaming services.
- H is HSPA which is high speed packet access.Its a enchancemnet over 3G and is mix of HSDPA (downlink) and HSUPA (uplink). Major changes were done on radio side which increased the data rates upto 3 and 7Mbps (Theoretically its much more)
- H+ is Evolved HSPA. HSPA was further improved into HSPA+ where technologies like MIMO antennas were introduced which boosted the data theoritically around 160Mbps downlink and around 15Mbps uplink (practically data rate is as we see this advertised as 21Mbps)
If you subscribe to a 3G plan you have then subscribed to all the above. Your mobile first looks out for cells/tower which are H+ capable, if it fails it tries the lower ones. When 3G is not at all available mobile falls back to Edge.
Also if you observe when you are in Edge, your calls and data will not work together. This is because voice and data calls use the same infrastructure in 2G whereas in 3G (or H or H+) you will be able to able to browse on your phone while you are on call. This because data and voice are separated and can work parallely in a 3G network.
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