Unfamiliar number; a quick check over at Whitepages.com turned up "suspected spam" as the result, with no revers lookup hit on public directories.  Did not answer, won't be returning the call.

Called and I didn't answer. Didn't leave message.

I called the number back and got a recording saying "Thanks for calling.  The survey you have called for has finished."  I never signed up for a survey.... Sounds smammy to me.

They got ahold of my cell phone number- left no message.

Just got a call. No message left. I will block.