I cannot receive some calls on my phone. Or rather, the caller gets through, but my phone doesn't ring, so I'm notified of a missed call. This mainly happens with corporate calls using their systems. Mobile callers get through OK.
In the top bar of my Android screen, there is a 'no entry' type of sign. I've looked through settings, but, although I do recall setting something up, I've no idea if this is causing the problem, nor how to disable it.
Any ideas?