Can my iPhone be tapped by police if they have never had any contact with my iphone?

Can my iPhone be tapped by police if they have never had any contact with my iphone? - 1

Added (1). Also, If my iphone is tapped and I change my number does it make a difference?

Yes, but only in situations when they have to.

Law enforcement has access to your phone conversations, emails, and messages through your wireless provider. Everything you do is recorded for such purposes. If you change your number, it doesn't matter because the new number is still linked to you personally. If you are suspected of a crime or have been identified as a threat, they can monitor your phone in real time.

Furthermore, you can be tracked via the cell towers near where you travel and use your phone. Through triangularization (not GPS) your exact location can be determined at any moment.

If you want total privacy, ditch your cellphone, home phone, PC, Internet service, and stay away from the thousands of surveillance cameras that are everywhere anymore.

Of course, but they wouldnt if there isn't a reason.

Well, they can always view your calls through your service provider. So yeah.