Yeah, one would think that a national phone carrier would only send through properly sourced data. But I can tell you from experience that no, they let through

Yeah, one would think that a national phone carrier would only send through properly sourced data. But I can tell you from experience that no, they let through garbage. I regularly see "phone numbers" like "11111111111111" or "0000000000" or even "01120155512121234". They act like they're the phone company and don't have to care ...