These guys use various names and call from different area codes and spoofed numbers, but they are the same guys (I recognize Mike/Jim/Robert/Steve as all being the same person). They use names like Crown Home Improvement, Pacific Coast Home Solutions, Clearview Home Improvements, Advanced Remodeling Center, and JTB Home Improvement. I have actually had them call 3 times within one hour with the same guy, different name, and different company name. They try to overcome my blocking device by calling me from multiple phones, all showing the same phoney number about 3 seconds apart, just to make me think they are not getting blocked. Talk about scumbags!!
Telemarketing contracting company out in Inglewood, in Los Angeles CA area. Uses "Unknown Name" ID. Has called several times w/o leaving a message. Also reported at mrnumber.com/1-310-362-1842 , numberguru.com/310-362-1842 , whocalled.us/lookup/3103621842 and whocallsme.com/Phone-Number.aspx/3103621842 just to name a few.
Many debt collectors have their calls set up to show "Out of area" in the caller ID. Many phones will block a number, but only some phones will block "Out of area", "Private number", etc. they also spoof their calls to look like they are from invalid area codes (001 as an example). Phone company will tell you that you can't block it because it's invalid.