How to test a WR11 router step by step. 
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6.2  Test SIM 1 
Ensure that an antenna (or both if using an LTE unit) is connected and the router is located in an area 
with good signal strength. 
Navigate to: 
Configuration - Network > Interfaces > Advanced > PPP 1 > Mobile 
Change W-WAN SIM: from “Any” to “SIM 1” 
 
Click Apply. 
 
 
Next navigate to 
Configuration - Network > Interfaces > Mobile 
And select SIM 1 
 
 
Under “Mobile Settings” 
Enter the correct APN for the SIM card installed in slot 1 
 
Click Apply.