They called but no one answerd, I returned the call but yet again no one answered.

Called me this morning and I called back. When a lady answered she asked for me, I just hung up. If it was really important I assume they would call back and leave a voicemail which hasn't happened. Spam?

I received a call from this number and answered.  only received dead air, caller hung up after 10 seconds.  They called back the next morning  but I missed that call, no voicemail

This number calls me several times a day. I don't answer an unknown area code and they never leave a message.

Calls several times a day, never answers when I say "hello"