3G - 3rd Generation of Telecommunication Standards; is a standard of cellular connectivity which allows for speeds of minimum 2Mb/s.
HSDPA (High-Speed Downlink Packet Access) is a 3G enhancement is a new
mobile data protocol and is sometimes referred to as a 3.5G.HSDPA speeds
can reach 3.6 Mbps downstream and 348 Kbps upstream. HSDPA-plus provids
much more faster speed.(7.2Mbps)