Generally, the officer/s who witness the driver using a phone will ask for the phone number. Using their radio, the officer will get the radio operator to phone the number which identifies the phone and then shows up on the phone records obviously just after the driver was seen using it. This is good evidence. In the unlikely event the driver refuses to supply the number, the officer can seize the phone as evidence under sec 19 PACE.
Generally, the officer/s who witness the driver using a phone will ask for the phone number. Using their radio, the officer will get the radio operator to phone the number which identifies the phone and then shows up on the phone records obviously just after the driver was seen using it. This is good evidence. In the unlikely event the driver refuses to supply the number, the officer can seize the phone as evidence under sec 19 PACE.