I had scheduled a phone interview and set my phone to take calls from unknown numbers. When the recruiter called, it went to voicemail because she called me from a "no caller ID" line. She left a callback number which I called back right away (several times) but it went directly to her voicemail without even ringing. I left her a voicemail and sent her an email telling her I was available and still interested in talking, but never got a response. It has now been 4 days.