How the GPRS module works Connect to the operator's network through a SIM card and use wireless channels to communicate with mobile base stations. GPRC requires enhanced mobile stations, as existing mobile stations were designed according to the GSM network, and they were unable in handling enhanced data packets. These mobile stations are also capable of. This page covers GPRS (General Packet Radio Service) network interfaces used in both the transmission plane and the control plane. We'll be looking at the Um, Gb, Gn, Gp, Gi, Gr, Gc, Gf, Gd, and Gs interfaces. Unlike traditional circuit-switched GSM services, GPRS allows for packet switching, which improves bandwidth.