Enable SIM-switch

config lte setting modem1 
    config auto-switch 
        set by-disconnect enable
        set by-signal enable 
        set by-data-plan enable 
        set disconnect-threshold 1 
        set disconnect-period 600 
        set switch-back by time by-timer 
        set switch-back-by-time 00:01 
        set switch-back-by-timer 3600
    end
end 

SIM-switching can be configured by data plan, disconnect settings, signal strength, coupled with switch back by time or by timer. All these options are under the “Auto switch” setting.

Parameter	Description
by-disconnect	The SIM card switches when the active card gets disconnected according to the 'disconnect-threshold' and 'disconnect-period'.
by-signal	The SIM card switches when the signal strength gets weaker than the signal-threshold.
by-data-plan	The SIM card switches when 'capacity' is overrun and 'overage' is enabled.
disconnect-threshold	The number (1 —100) of disconnects for SIM switch to take place.
disconnect-period	The evaluation period (600 — 18000) in seconds for SIM switch.
switch-back	Enables switching back to the preferred SIM card.
switch-back-by-time	Switches over to the preferred SIM /carrier at a specified (UTC) time (HH:MM).
switch-back-by-timer	Switches over to the preferred SIM/carrier after a given time (3600- 2147483647) in seconds.