So I was just curious, I had some plans with my buddies today. My one friend who I'm supposed to pick up, when I've been calling his phone today it just rings once and then goes to voicemail or it does that weird half-ring thing, then one ring and then goes to his voicemail. I barely ever call people on the phone, and I know when someone is ignoring your call (you can usually tell because they'll hang up mid-ring or something). In this case it seems more like a process, because I've called him like 10 times because I'm supposed to be picking him up, and it does the same thing. Ring-Voicemail, or Ri-Ring-Voicemail.
I have no reason to suspect he'd block my number... But as I said I've never experience this before so I'm not sure what it means.