Why can't I enable dual SIM sending on Go SMS?

[AC Question]

I have Go SMS app on my phone. I am using to sim cards. (2networks), but only one network is lighting up so I can send a message. But how about my other sim card? I also need to use this one too! I have credits/balance both sim cards. How come the other one isnt lighting up?

 

[Rukbat]

Most apps will only work with one SIM. You'll have to switch one on and the other off.