GSM:

☆ Uses one among 7 slots

☆ Connecting resources to each unit from remote location to the back office is done through a direct dial up

☆ Circuit switched mode of operations

☆ Dedicated channel all the way to the destination is provided to the customer

GPRS:

☆ Uses as many as 4+1 time slots

☆ Does not claim any resources until some data is sent. The information is divided into packets

☆ Packet switched mode of operations

☆ One or more dedicated channels are assigned by the operator specifically for shared use