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

To specify the maximum number of times that the fixed-platform ISR can switch over between its two 
SIM cards when a SIM card loses service, use the gsm sim max-retry command in controller 
configuration mode.

gsm sim max-retry 0–65535

Controller configuration (config-controller)

When the primary SIM loses service, the ISR automatically tries to switch over to the secondary SIM. 

If you do not set the maximum number of tries, the ISR tries to the switchover for a maximum of 10 
times (default). 

Setting the number of retries to 0 disables the automatic switchover and keeps the service tied to one 
SIM (the primary SIM).

Every time a SIM switchover occurs, a counter is incremented until it reaches the maximum number of 
switchover attempts. Then, service is tied to one SIM (the primary SIM) and automatic SIM switchover 
is stopped.

To see the number of switchover attempts, use the show cellular 0 security command.

The following example shows how to set the maximum number of SIM switchover retries to 20:

router(config-controller)# gsm sim max-retry 20

Maximum number of times the switchover between the two SIM cards can 
occur. 

15.1(4)M

This command was introduced.

Sets the failover timer.

Authenticates the SIM card.

Modifies the primary slot assignment.

Configures the SIM profile.