3G typically operates in separate frequencies than 2G and 2.5G uses , thus allowing mobile phones to switch from one to the other when capable. Summary: 2.5G implements packet switching along with the circuit switching in 2G. 2.5G has much faster data rates than 2G.
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2.5G improves the available data rates supported by the air interface, thereby permitting the introduction of new, data-oriented services and applications . The increased data rates rise to a theoretical maximum of 384 Kbps, although in the field available data rates may often be as low as 20 Kbps.
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