Hello @mi980
For 4G config here an example:
! Attach configured profiles to cellular 0
controller Cellular 0
 lte sim data-profile 1 attach-profile 1 slot 0
!
!
!
! Cellular 0 configuration.
interface Cellular0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly in
 encapsulation slip
 dialer in-band
 dialer string lte
 dialer-group 1
 async mode interactive
!
!
 For failover you can find one solution here:
https://supportforums.cisco.com/t5/wan-routing-and-switching/wan-failover-over-4g-wireless/td-p/1806672
 
-If I helped you somehow, please, rate it as useful.-