Hi im having a problem where I can't receive calls or make calls on my gpro. I'm on CM 11 M6 build. The phone doesn't even register missed calls so I'm at loss here. Its not a sim issue or anything like that cause texts work fine. Im thinking of downgrading to CM 10.2 if can't fix this. Any help is appreciated. Also I have another gpro that is having the same issue on CM 11 M5 build.