How to reset a single SIM?

That’s correct, it’s how I have it setup.

Is there an advantage to putting one in A and one in B? Is it only for redundancy? If so, doesn’t using 2 sim slots accomplish the same thing?

Having two distinct WANs allows immediate failover if one goes below a threshold that you set. In my case, I have Speedfusion setup (with Fusionhub Solo at Vultr) so that BOTH WANs operate at the same time and provide the highest reliability and bandwidth bonding in some cases.

Personally, I don’t see a need for having two sims for a single WAN, but others may think differently.

I guess the right answer is “it depends.”

That’s how I have mine setup as well. 2 sims in both sim slots (not in A and B, but in 1 and 2) and I have SpeedFusion on Azure.

ok so one sim per cellular unit, I got it now.
Do you have all traffic go out the speed fusion.

A couple of reasons to use dual sims per cellular.
#1 Your device only has one cellular
#2 You have limited data plans per device
#3 You want to have cariier diversity for one or more cellular units.

We for example ship a tri carrier sim in sim a, and a business verizon with static ip in slot b.