3G is the 3rd Generation of mobile phone standards. It superseeds 2G (GSM). GSM is the most used standard in older phones. Your phone supports 2G and 3G. 3G offers a greater mobile network capacity and more advanced mobile services.
HSDPA (High Speed Downlink Packet Access) is a data transmission available for 3G networks. Theoretically it can achieve
theoretical data transmission speeds up to 15 Mbps. Most services offer 2-4 Mbps at the moment. It can be used for downloading.
For more information, you could look
here for 3G and
here for HSDPA.
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