Called at 6:15pm EST.  Said, "Hello" three times.  Hang up.

This number has called several times each day and at night.  The caller i.d. says simply "Service Message," but no message is left.  I don't answer calls from numbers I don't recognize.  I suspect this a political call as we have a run-off for U.S. representative in my area and we are being bombarded with political messages.