I can't be sure about Metro since I don't use them, but I've gone from postpaid to pre-paid on T-mobile and I no longer get the the warning/caller ID saying it. Even on their page, it does not mention anything about pre-paid.
Also, their website doesn't have the option for me like it used to, and here's a thread on their site from 2018 that talks about it not being available to pre-paid users:
https://www.t-mobile.com/support/plans-features/scam-id-and-...
Also, their website doesn't have the option for me like it used to, and here's a thread on their site from 2018 that talks about it not being available to pre-paid users:
https://community.t-mobile.com/thread/146574