Difference beween E and G network

Friends there are many people wondering what does that E or G means which is shown in gprs enabled mobile.

Yesterday itself a guy who was travellin with me in bus was asking me what does that mean and is it a kind of service which is chargeable. So here i would tell what that means.

Its just the basic info for the newbies. Its not only E and G but there are also 3G n H as well.
Here what they stand for
G - gprs
E - edge
3G - UMTS
H - HSDPA (3.5G)

First one is the weakest and last one is obviously the strongest. Whenever ur in an area of strong signal strenght u'll get the better network for ur mobile. And whenever the stronger network is unavailable it switches to the weaker signal.

In 3G/H u can make voice calls n data transfer simultaneously which is not the case in E n G.

Here is some more information on edge since many get E most of the time in most of the areas..

EDGE-
Enhanced Data for Global
Evolution.

An upgrade for GSM/GPRS networks that triples data rates (speed) over standard GPRS.

EDGE is used automatically
when both the phone and network support it. EDGE phones will automatically
revert to the slower GPRS standard when EDGE service
is not available.
Although many EDGE phones
and devices are theoretically
capable of up to 236 Kbps, most EDGE networks are only
configured to allow up to 135
Kbps, to conserve spectrum resources. Real-world data rates are usually lower than the maximum.
Because it is based on existing GSM and GPRS technology, EDGE is a smooth upgrade for GSM network operators.
Although EDGE works at a low level within the GSM standard that includes voice,
the main benefit is to increase GPRS data rates.
GPRS operating over EDGE is
called EGPRS.
Although EDGE is faster than GPRS, it is not as fast as 3G technologies such as HSDPA and EVDO.