With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
c3gGsmChannelNumber
Cisco 3G Gsm Channel Number
1.3.6.1.4.1.9.9.661.1.3.4.1.1.4
Channel number to which the modem is attached.
Back to CISCO-WAN-3G-MIB MIB page.
IPHost Network monitor allows you to monitor c3gGsmChannelNumber on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.