said by soitgoes2 
:said by hwittenb :They probably lookup who owns the NPA NXX X number block in a database like
I would hope they look up more than that, but who knows.
I do know that current carrier info is contained in some databases. There was a while when the Nextel website would let you do an LNP check that gave the current carrier (not the carrier of the NPANXX block).
I just tried my cellphone number that I ported from a land line 3 years ago, and it came up "Fixed Line." I think the "ReduceFraud.com" guys are simply charging for NPA NXX lookups! (Nice work if you can get it!) 
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