Confusion on GSM, GPRS, EDGE, 3G, 4G
GSM and GPRS are two separate things, GSM is used for SMS texting and calls. GPRS is used for mobile data transmission over the internet (can be used for calls and texting also). GPRS, EDGE, HSDPA, 3G, 4G are mobile communication protocols, the most obvious difference is in speed and bandwith, i lined them from slowest to fastest.