Calls and never leaves a message

Here's a new one that started this evening @ 7:45pm same story as above. "435" is a Utah area code but a search comes up dry.

Calls many times/day and does not leae a message.  The name Sowy appears as the name.

Called several times, however, no message left

Calls have been coming in since 8/17/07 no message; husband answered - female voice asked for me BY NAME!!- was told I was not home - kept calling all night...last call came at 8:45 pm -   it was like the line was left open.  No one said anything just a bunch of background noise like a party...who are these people??