Received several calls from this number, a few days apart.  No message left.

I receieved a call twice, each time I heard a muffled voice, like bad service. Then a "Hi, this is Mary..." the "Oh, sorry to bother you" and it hung up. Both were pre recorded voices.

This number called my cell.  When I answered, a recording said press 1 to answer or 2 to leave a voicemail.  When I pressed 1, the recording said that the caller hung up.  Could be a telemarketer call center.  A reputable company probably would have identified themselves, even on a recording.

Just called and didn't leave a message.
I have been getting a lot of these phone calls lately.  I also had one marked 'unknown caller this morning about an hour before this one.  didn't ans. that one either.

I have had rampant telemarketing calls recently .  I assume this was one more.  I never answer them and do block them for the future.  I just check now and then to make sure it's not a friend or a business I do business with and would want to talk with.  Nope.  Never is.