Not sure exactly what they all do, some are bank scams, some are tech support, but i never answer, they just leave voicemails which is super annoying. NOTE: i havent checked any of these so proceed with caution
929 299 5749
800 329 8448
888 222 0414
929 424 9044
800 698 7095
775 332 2118
435 465 3467
888 505 3219
315 533 8630
410 844 0941
347 852 6188
929 152 0425
202 216 8797