As is known to all, GPRS module and GSM module, data wireless passthrough module kinds also someone will both often confused. But that the two are not one thing, is general packet radio service GPRS, GSM global system for mobile communications, can say the continuation of GPRS is based on GSM system, developed bearing and packet data transmission function. In simple terms, the GSM is a circuit switching system and GPRS is packet switching system. Can tell the difference from more respects.