The maximum data throughput value is 43.2 kbit/s by using the HSCSD service. To be more exact, the throughput is 43.2 kbit/s downlink + 14.4 kbit/s uplink, or 28.8 kbit/s downlink + 28.8 kbit/s uplink, however, the service provider can restrict the maximum data transmission speed. The transmission speed can also be altered during the session depending on the GSM network configuration, the quality of the connection and the amount of free capacity in the network.