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Cisco 881G with 4G backup not working

I can't get NAT working with 4G backup.

Basics:

F4 is working normally (NAT working)
4G connection is working normally, but inside cannot access outside when F4 is down

I can ping 8.8.8.8 thought 4G connection (when F4 is down)

Config might have few extra-lines cos i have run wizard and tried few combinations to get it to work.
And i snipped some config off

Router#show run
Building configuration...

Current configuration : 5195 bytes
!
! Last configuration change at 11:01:10 UTC Mon Mar 23 2015
!
version 15.5

!
!

!
ip dhcp excluded-address 10.10.12.1 10.10.12.99
ip dhcp excluded-address 10.10.12.200 10.10.12.254
!
ip dhcp pool insidepool
 import all
 network 10.10.12.0 255.255.255.0
 dns-server 8.8.8.8
 default-router 10.10.12.1
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
controller Cellular 0
 lte modem link-recovery rssi onset-threshold -110
 lte modem link-recovery monitor-timer 20
 lte modem link-recovery wait-timer 10
 lte modem link-recovery debounce-count 6
!
track 1 ip sla 1 reachability
!
!
!
!
!
!
!
!
!
!
!
!
interface Cellular0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly in
 encapsulation slip
 dialer in-band
 dialer pool-member 1
 async mode interactive
!
interface Cellular1
 no ip address
 encapsulation slip
!
interface FastEthernet0
 no ip address
!
interface FastEthernet1
 no ip address
!
interface FastEthernet2
 no ip address
!
interface FastEthernet3
 no ip address
!
interface FastEthernet4
 ip address 188.127.x.x 255.255.255.248
 ip nat outside
 ip virtual-reassembly in
 duplex auto
 speed auto
!
interface Vlan1
 ip address 10.10.12.1 255.255.255.0
 ip nat inside
 ip nat enable
 ip virtual-reassembly in
!
interface Dialer0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly in
 encapsulation slip
 dialer pool 1
 dialer idle-timeout 0
 dialer string lte
 dialer persistent
!
ip local policy route-map track-primary-if
ip forward-protocol nd
ip http server
ip http access-class 23
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
!
ip nat inside source list 1 interface FastEthernet4 overload
ip nat inside source list 23 interface Dialer0 overload
ip route 0.0.0.0 0.0.0.0 FastEthernet4 188.127.x.x (WAN gateway)
ip route 0.0.0.0 0.0.0.0 Dialer0 253
!
ip sla 1
 icmp-echo x.x.x.x source-interface FastEthernet4
 frequency 5

route-map backup permit 1
 match ip address 23
 match interface Dialer0
!
route-map primary permit 1
 match ip address 23
 match interface FastEthernet4
!
access-list 1 remark CCP_ACL Category=2
access-list 1 permit 10.10.12.0 0.0.0.255
access-list 23 permit 10.10.12.0 0.0.0.255
access-list 100 remark CCP_ACL Category=0
access-list 100 permit icmp any host x.x.x.x
!
control-plane
!
!
!
mgcp behavior rsip-range tgcp-only
mgcp behavior comedia-role none
mgcp behavior comedia-check-media-src disable
mgcp behavior comedia-sdp-force disable
!
mgcp profile default
!
!
!
!
end

Router#

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