Can police track a phone number when I remove it's sim card?
If the Police have your mobile phone number then I understand they can track your mobile phone. Now, I understand the mobile phone number is linked to the sim card but if you simply change the sim card does that stop the Police from tracking you? Because I also understand that all mobile phones have a IMEI number.
Can the fact they had the sim card mobile number while inserted into a mobile phone give them access to that number so even if you change the sim card, they can track the mobile phone no matter what sim card is inserted? Hence, if so, is a new mobile phone and sim card is the only option ?
I don't know the technical details to answer your specific question - can police track a phone number, but it might not be relevant.
If your phone has been tracked in the past and you live in a place where your adversary has access to cell phone location data, and you do get both a new phone and a new phone number, your new "mobile phone identity" can be easily connected to your old one if you don't also change your behaviour radically. If you keep your new phone on for the same periods of time, move around in the same patterns etc, it should be fairly easy to connect the two profiles simply by matching movement patterns. In fact, depending on how accurate cell tower localization is and where you live, simply going to work and coming home every day is probably enough to connect your new phone and phone number to you/your old phone and phone number.