Omnipoint Communications, Inc. — It's a phone network, not a caller!
Omnipoint happens to be the cell-phone carrier of record for my own phone exchange. According to Wikipedia, it was absorbed in 2000 by a larger company, which is now called T-Mobile.
It transmits the calls from most of the exchanges mentioned in the original complaints on this site, & many of those in the 30-or-so comments after the complaints (I didn't check them all). I found all these complaints while doing a web-search for Omnipoint's contact info. I have no professional or personal interest in either defending or attacking Omnipoint, which I only heard of today while trying to solve a problem related to another company that uses their network.
If you're going to look up info on the internet, make sure you understand the column or subject headings. In particular, the online reverse phone directories MAY give you a city, a zip code &/or a phone company (as in these cases), but if you want a caller's name or address, they will ask you to pay for it. If you want to stop a phone scammer or harrasser, it may well be worth the few bucks -- though there's no guarantee that any of these commercial sites is perfectly up-to-date.
IF you manage to get the actual name & address associated with the full phone number (not just the exchange), you might follow the instructions given in the comment by scoochums (1 August 2012, below TheRightway's complaint) on how to contact the FBI. Slandering the phone company on this website won't help anyone.
You can verify exchange/company info at:
(If you use the 2nd URL, you can substitute another state for "NY" at the end.)