Cisco Cisco 1900 2900 3900 Series 4-Port Gigabit Ethernet HS-WIC with PoE

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Configuring Cisco EHWIC and 880G for 3.7G (HSPA+)/3.5G (HSPA)
  Features
10
Configuring Cisco EHWIC-3G-HSPA-U
OL-24265-03
3G WWAN MIB Persistence
This feature allows you to retain 3G WWAN MIB object values and trap settings across router reloads.
Before configuring 3G WWAN MIB, you should perform some SNMP pre-configuration to avoid getting 
warning messages. The following is an example of SNMP pre-configuration:
snmp-server community public RO
snmp-server community private RW
snmp-server enable traps c3g
This example shows the settings that you need to configure this feature for C881G-U-K9:
controller Cellular 0
gsm event rssi onset mib-trap All-gsm
gsm event rssi onset threshold -84
gsm event rssi abate mib-trap All-gsm
gsm event rssi abate threshold -82
gsm event temperature onset mib-trap
gsm event temperature onset threshold 41
gsm event temperature abate mib-trap
gsm event temperature abate threshold 40
gsm event modem-state mib-trap down
gsm event modem-state mib-trap up
gsm event service mib-trap
gsm event network mib-trap
gsm event connection-status mib-trap All-gsm