In the past two months, I've been getting a call a day from numbers like this that apparently belong to very small towns - caller ID says this one is "Denton Nebraska".  I doubt the town of Denton is calling me.  Nor are at least 6 other small Nebraska towns.  I guess since they never leave a message (and I never answer), I'll never know what the calls are specifically about but I'm pretty certain of one thing: They are SCAMS!! (or they'd leave a message and I'd call them back.