Question

Hi,

I want to allow two sim cards to be active at the same time and allow both to access the internet. When the signal gets weaker, I want one of them to switch to the other. So I want to balance data

Answer 1

You would need two routers to do this.

Answer 2

You cant have 2 Sims active at the same time, but what i think you're after is a failover connection. ie when one carrier looses signal, it could switch sims and enable the 2nd sim service (different carrier prefered) with a short downtime.

This is doable with any dual sim RUT.

Load Balancing is when you want to Balance/Share the load of multiple devices over multiple WAN connections. Not usually used for a fail over type scenario, though it can be.