Hmmm. Interesting.. When I was on postpaid, I used to get caller ID with something like "Scam Likely", but since switching to pre-paid, I don't get those anymore. Looking at their page about it, it only mentions post-paid.

https://www.t-mobile.com/support/plans-features/scam-id-and-...

Here's also a thread about it on their site.

https://community.t-mobile.com/thread/146574