I get called every few days, they leave no message.

Try answering. If they seem suspicious, you know what to do.

Called both my landlines today: no message on first call, nobody there on second.

This number has called numerous times but never leaves a message.  This morning I decided to answer.  When I answered and said hello, a male voice started to speak and stumble over his words but almost immediately the connection was broken.  The caller ID said "Private Name"

This number has called numerous times but never leaves a message.  This morning I decided to answer.  When I answered and said hello, a male voice started to speak and stumble over his words but almost immediately the connection was broken.  The caller ID said "Private Name"