With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
c3gGsmTotalByteTransmitted
Cisco 3G Gsm Total Byte Transmitted
1.3.6.1.4.1.9.9.661.1.3.2.1.19
Total number of bytes transmitted for all calls. It is the total number of bytes transmitted by modem, not to be confused with the number of bytes transmitted through the interface.
Back to CISCO-WAN-3G-MIB MIB page.
IPHost Network monitor allows you to monitor c3gGsmTotalByteTransmitted on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.