Basically, the same as others...
- I keep getting calls;
- They leave no message;
- I don't answer calls from unrecognized numbers, so I'm not sure if anybody is on the other side or not.

I am assuming this is some sort of SPAM/SCAM  and will mark it as such.
I don't call these type of numbers back, as I've heard too many horror stories regarding instances should you do so and it is indeed a scam.

So, my motto is simple:
1.  If I don't know the number, I don't answer it.
2.  If it's important or somebody that does need to reach me, they'll leave a message.

I'm so freakin tired of the so very many various phone scams.
And BTW, it is worthless to even register with the DNC list.  I have done this, a few times in fact, and yet I get on average 5 scam (or at least possible scam/spam) calls per week, sometimes that many in a single day.
I'm so tired of it!!

I am so glad this site (and some similar) are here.  The first thing I do after getting a call from an unrecognized number is to search it here.  I think it has saved me a lot of time and certainly much frustration!
Thank you 800notes.com.  You're one of the best!