I didn't particularly want to give them a dollar to see if they (as they claimed) knew who I was, my relatives, etc. But if anyone wishes to pay a dollar to determine whether they got 917-838-9491 correct, be my guest. Be warned that if they find less than 10 brothers and sisters, they missed some relatives. (At a guess they won't get any, or else they'll just get one brother.)
A Sprint cell number gave correct name, carrier, and city as well.
Trying a Google Voice number, though, gives only an unrelated cost center and "Level 3" as the provider.
Pretty impressive, overall. Now I can finally figure out all my phone contacts with completely useless names!