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First-Generation system which was analogue, circuit-switched and is now no longer used. This technology was generated in 1980s.
1G was soon replaced by the next generation 2G which uses digital radio signals, rather than analogue.
This is the next generation of digital mobile phones also known as GPRS. These phones were the first WAP enabled phones, giving access to the internet, though user experience was poor.
The 2G includes GSM and CDMA technologies that have been around since the 1990s.
The 2.5G is a technology defined between the second and the third generation.
2.5G provides additional features such as EDGE and HSCSD.
HSPA+ (High-Speed Packet Access) - is a third-generation technology protocol for mobile telephones designed to speed up network capacity and data transmission rate of cellular phones.