2G, uses GSM networks which are good for text messages and voice calls, and are limited when it comes to sending and receiving data. GSM phones use a technology called CSD (Circuit Switched Data) to transfer data. CSD requires the phone to make a special connection to the network before it can transfer data (like making a voice call) which can take up to 30 seconds. Once connected, the data is sent or received and the user is billed for the time spent online. Data transfer is relatively slow: 14.4 kbps (kilobits per second) for GSM 1800 networks (Orange and T-Mobile) and 9.6 kbps for GSM 900 networks (Vodafone and O2).
2.5G, offers higher data rates than 2G technology using GPRS (General Packet Radio Service) which is a method of enhancing 2G phones to enable them to send and receive data more rapidly. With a GPRS connection, the phone is “always on” and can transfer data immediately, and at higher speeds: typically 32 - 48 kbps. An additional benefit is that data can be transferred at the same time as making a voice call. GPRS is now available on most new phones.2.5G also uses EDGE (Enhanced Data rates for GSM Evolution) or EGPRS and this provides data transfer rates significantly faster than GPRS, with speeds of up to 384kbps.
3G, the key characteristic of a 3G network is its ability to transfer large amounts of data at high speed of between 384kbps up to 2 Mbps, enabling applications like video calling, video downloads, web browsing, email, etc.
3.5G, uses HSDPA (High Speed Downlink Packet Access) technology and is the fastest network available at the moment which supports speeds of up to 3.6Mbps.
At least now you know the difference, and when you go to buy a new phone, you can ask the question, ‘what communication method does this phone use’?
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