If you need to call for police assistance, you must have a phone. If you do not have a phone, you can try to contact the police using
Press U to open your phone, then open the phone app.
With the phone app open, press LEFT ARROW on your keyboard to open up the services menu, where you can select to call Police, EMS, Taxi, Mechanic, or AAA roadside. Simply press Enter and type in your message to send with your request.