This mode works in concert with the Data Usage feature. The router will make a best effort to keep data usage balanced between interfaces at a similar percentage of the assigned data cap in the Data Usage rule for each interface. For proper function, you need to create data usage rules for each WAN interface you will be load balancing. Make certain to select the Use with Load Balancing checkbox in the Data Usage rule editor.
Note
For dual-SIM devices, only one interface can connect at a time. If the SIMs are in the same connection set, SIM1 or SIM2 will be connected, but not both.
Data Usage Enable this global setting to allow profiles and interfaces to be configured for Data Usage management.