Redmi Note 3 - Duel Sim Question

Feb 2, 2016
I have a Redmi Note 3 and have a "duel sim" question.

I get terrible mobile signal in my village and am on Vodafone UK.

So I have a "Sure Signal" from them - basically a pico cell (signal booster).

It seems to only boost one of my Sim Cards. It will only boost the signal of the SIM card that is in position 1.

It is a 3G booster and my assumption is that both sim cards could handle 3G. Is this true? That is why I bought the phone. So that would be a bummer.....Thanks!