Just calls several times a day. Doesn't leave message. When I answer, no response or background sound and hangs up after 10 secs. When I call back, rings once and clicks and disconnects.
Calls up to twice a day at all hours, never leaves message on my machine, just hangs up. Very annoying, but my rule: if you can't leave a message, you are up to no good. So I don't pick up or try & call ID number back.