I recently learned about a secret feature of some sort for Android where I had to dial removed by Moderator . I was checking out the options available and after some time I found that both of my SIM cards deactivated. After tinkering about I could activate only one SIM but the other one can't be activated again and it is stuck in the unavailable mode. I've tried going back to the same menu but I can't seem to figure out what's the problem. Please help me out.