This article discusses a bit about the differences only four such data access (GPRS - EDGE - UMTS - HSDPA). Before there were four such data access, there are several other types of data access, the CSD (Circuit Switched Data).
GPRS (General Packet Radio Service):
a technology used for sending and receiving data packets. GPRS is often called 2.5G technology. Facilities provided by the GPRS: e-mail, MMS (picture messages), browsing the Internet. In theory GPRS provide access speeds between 56kbps to 115kbps.
EDGE (Enhanced Data for Global Evolution):
the development of GSM technology, the average has 3 times speed of GPRS speeds. EDGE access speed is theoretically about 384kbps. EDGE provides facilities like GPRS (e-mail, MMS, and browsing).
UMTS (Universal Mobile Telecommunications Service):
Further development of EDGE. UMTS is often called third generation (3G). In addition to providing Internet access facilities (e-mail, MMS, and browsing), UMTS also provides video streaming, video conferencing, and video calling *). In theory UMTS access speeds around 480kbps.
HSDPA (High Speed Downlink Packet Access):
is a further development of 3G data access. HSDPA is often referred to as generation 3.5 (3.5G) for HSDPA is still running on the 3G platform. In theory the same speed HSDPA data access, such as 480kbps, but it was definitely faster HSDPA. If not what good is creating faster HSDPA. The more exact the better new technologies.
All four data access over a modem implemented on mobile phone / cell phone, there is also a special modem that is used for connection.
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