No message, no one speaks

I didn't answer. "Out of Area" They left no message.

Thumbs Up is a tele-marketing firm in St Louis.

Caller ID said 'Thumbs Up'. Didn't answer. No message.

Why do  people call and leave no message. Either state your purpose, or stop calling. Thanks

Been getting these calls a lot and the person did speak when I answered. She wanted my husband and when told he wasn't home, she said thanks and hung up. One did speak to me yesterday and it was a political call. I told her the opposite of what she wanted to know so she hung up after that.  We are in the St. Louis area and that's the only reason I answered. I'm waiting on a call and thought these might be it. Nope.