A computer-implemented system and method for automated traffic flow control using quality of service authorization based on type of radio access technology and other parameters for one or more devices enabled for connectivity over cellular network are disclosed. The computer-implemented method includes receiving credit control request for the one or more devices from a subscriber; receiving quality of service (QoS) configuration authorized for the one or more devices for the subscriber from a configuration database; combining the authorized QoS parameters for the subscriber; comparing them against the requested QoS by the subscriber; and updating charging rules for the subscriber as an answer to the credit control request.