Reverse Telephone number lookup
This capability used to be great. You could get a phone number and find out the owner.
Caller ID spoofing has greatly diminished the viability of this search in cases where people do not want to be found.
Sure It’s fine when you know that the number is legit. but if the person is trying to cover their tracks, they can send ANY telephone number and Identifier text when they call you. This mechanism is behind many of the robo-callers pretending to be a neighbor, A call from the IRS etc.