[ipython]

Funny, the same telecoms that whine about how hard this traffic is to stop... are also selling a "premium" service to customers- who then manually tag unwanted calls so that the telecom can sell that data back to other customers...

[dredmorbius]

Unsurprisingly: telcos sell outbound dialing capabilities to business customers.

For spam mitigations to work, the cost of selling that business must exceed its revenue.

Some, and I won't mention AT&T by name, are very curiously opposed to any regulations touching this.

[dhosek]

I don’t seem to be charged for Scam Shield on my account. I’ve had one unknown number call and not leave a message over the last month, which is a far cry from the 20–40 spam calls per day some people report.

[dredmorbius]

There are both free and premium tiers:

<https://www.t-mobile.com/benefits/scam-shield>

The free tier seems to identify but not block likely scam calls. T-Mobile's website skews sales-heavy, and doesn't feature much technical information.

The premium features appear to be app-dependent, and may not work on feature phones.