Welcome to Android Central! Which phone and which carrier? Are you saying that you're not seeing the Caller ID of people calling you, or that other people don't get your Caller ID when you call them?
Be aware that this is an independent community forum, without any direct affiliation with Google or any other company, so there isn't anything we can directly do to restore your Caller ID.
Yeah, phone dependent because mine is in my phone app settings under Supplementary Services. So for my Samsung I have to open the phone app, kind of like I was going to make a call, then use the 3 dots to open Call Settings>Supplementary Services>Show your caller ID>Network default, Always, Never.