On: FCC orders phone companies to block scam text messages

[zikduruqe]

It's not random, you phone number is part of a NPA-NXX-XXXX.

NPA is a number plan area (area code) which is known.

NXX is N=2 to 9, X=0 to 9, is an office code.

XXXX is a station code, where X is 0 to 9.