I have an HTC Inspire 4G. I don't have any issues calling any other cell phones or landlines, and only one person has trouble contacting me. His texts go through, but when he calls me it just rings a couple of times then goes straight to a busy signal. It doesn't ring at all on my end. One of the times he tried calling, he got through to my voicemail, but still, I don't get anything. This has been happening for a couple of weeks.
I don't have any sort of call forwarding set up for his number (or any number) and the "straight to voicemail" box isn't checked off for his number.
Re: Unable to receive calls from a specific person
Check your block caller list, maybe you some how added the person to it. Even when a person is blocked from calling you, you will still get their text. Imo that is the only thing it can be, the person is on that blocked list.