Unknow number displaying "Arkansas City, KS" (Kansas town).

This might be a new kid in town.  Two calls in as many days.  The first one was a hang-up but acting against my protocol to not respond to unfamiliar phone numbers, I answered and the line was silent.

I received a call from 620-307-2239 and they ask me if I was interested in helping with some type of technology that builds robots for the government I hang up on them!!

I have received at least two calls a day for a couple of months. I answered once and got silence. Scammers or prowlers to check my hours at home.