Can the police still track someone if they changed their cell phone number?

If the person who called me from their old phone threatened me but then if I find out that person's number changed and no longer has that number, will the police still be able to track that person who had the old cell phone number?

Anonymous2021-03-29T14:00:33Z

Don't worry Sean, the police can track down your number.

Bruce2021-03-29T00:22:00Z

He may not have the phone, but the company that provided service still has his personal information. 

Anonymous2021-03-28T22:37:45Z

Of course they can.