3G is a another new technology rolling out in different parts of india, it promises to be a great technology which allows you to use high speed internet and related services on your mobile phone, you might have a 3G ready mobile phone, or read how to check if your mobile phone supports 3G.
These days there are 2 types of 3G phones available today, some give true 3G experience while others can support only low speed 3G access.
High Speed 3G Protocol – HSPA or HSDPA (High Speed Packet Access) is a new generation communication protocol that allows data connections up to 21 Mbps per user in good coverage and quality conditions. Today mobile phones, datacards & USB dongles are available with HSPA.
Low Speed 3G Protocol – WCDMA (Wideband Code Division Multiple Access) is a 3G technology version that allows data connections up to 384 kbps per user (64kbps, 128kbps, 384 kbps) in good coverage and quality conditions.
Now if your mobile phone supports HSPA or HSDPA protocol then you can experience high speed 3G services on your phone, or if does support only upto WCDMA protocol then you can use 3G on your phone but it will be comparatively slow than phones which supports high speed 3G protocol.
You can check the mobile phone specifications while buying it from the manufacturer or dealer , or just do a search with your phone model name on gsmarena.com and do a quick search.
Find the detailed specifications on your phone which will help you see which 3G protocol your phone supports as for example shown in the image below for my google nexus one.
Additional Note: High Speed Packet Access (HSPA) is an amalgamation of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), that extends and improves the performance of existing WCDMA protocols.