Called my cell. Left no message.

Carrier is Enflick Mobile, which isn't really a carrier, but the developer of an app called TextNow, which offers unlimited anonymous texting and calling. I've had several calls and texts from numbers that trace to this app since I placed a for sale ad on craigslist. They want to "help" you sell your item or con you out of money. It's a con, either way. Go give the developer one-star reviews in the app store and tell them why you're doing it in the details. They might take note.

Thank Vincent they keep calling me, your post was helpful.

They called my cell phone with a "free" offer which would only cost me $6.95 to receive. It included $100. Gift card, and two more gift cards for a total of $165. In free gift cards. They just wanted my credit card, debit card or other form of payment requiring an electronic payment and access to your personal information. I asked for an email explaining this program that claimed to have gotten my phone number from a recent online purchase that I had made but didn't know my name or zip code. My cell and land lines are both on the no call list. I hung up. I don't trust unsolicited calls that require payment for free items. Has anyone else received this offer?

I received the call on my cell when I was grocery shopping.  They hung up before I could see what the number was.  It came in at 3:36 p.m. MDT from Oakland, NE.  I don't return calls from numbers that are unfamiliar and I am on the DO NOT CALL LIST.  I always the via a search engine.  Thanks a lot to those who posted.  I will delete the number now.