Who called from 7863459064

For legal reasons this site can't designate a particular caller a "Scam" or a "Fraud". Nothing is stopping you from doing so. This has been gone over here countless times.
"SMS" generally indicates a text message. Not always. A fraudulent Telemarketer can spoof any number & make your CID display anything they'd like it to. Get a call blocker for your land line & a call blocking app. for your smart phone. Both are inexpensive now (under $50) & apps. are available free or for less than $5.
Be Safe. Be Aware.
Gunnar

They called at 9:00AM Saturday.

I didn't recognize number, so I let it go to answering machine.
No message was left.

Must not have been that important!

Received a call from this number, rang 4 times, then they hung up.  Put them on block.

Same here.  Number called, I didn't answer, no message left.

SMS = Short Message Service  or as commonly called on cell phones a TEXT message .