GPRS, standing for General Packet Radio Service, is a new packet data bearer services based on the existing GSM system. The most fundamental difference of GPRS system and the existing GSM voice is: GSM is a circuit-switched system and GPRS is a packet switching system. Therefore, GPRS especially suitable for intermittent, sudden or frequent, small amounts of data transfer, but also to the occasional large data transfers. This feature is suitable for most mobile Internet applications.