Swapping SIMs automatically

Is it possible for the automatic swapping of sim cards when you have a dual simcard setup?

I tried using:

ppp 1 deact_rq
ppp 2 act_rq

To change from sim 1 to sim 2 - it didnt work. Is there a way of scripting this automatic change over to keep the sims sweet on a time basis?

I have limited scripting experience so any help would be great. Ta.