The infrastructure is there[1]. The theory is that they don't want to kick off their biggest customers that get billed for the oversized use of the phone system

The infrastructure is there[1]. The theory is that they don't want to kick off their biggest customers that get billed for the oversized use of the phone system. [1]: https://en.wikipedia.org/wiki/Automatic_number_identification https://en.wikipedia.org/wiki/Automatic_number_identificatio...