When a stranger texts

I've been getting early-morning, like 7:00 AM, text messages from someone I don't know. The phone number is 843-473-4374. 843 is an area code for coastal South Carolina. I don't know anyone there, and the phone number doesn't match anything in my address book.

The message reads: "Morning how r u?"

I have not texted back "Who are you?" in case this is some sort of scam whereby my text ends up costing me $1,000 or I end up receiving lots of junk text or spam or some other malfeasance.

Any ideas people?

With my luck, the text will be coming from inside the house!