On a door-to-door, same day move, you can switch off and unplug your refrigerator and freezer just before the move. All fridges and freezers need to be completely empty for your move.
For any remaining contents in your fridge or freezer, putting everything into eskies or similar practical, cooling storage solution is your best option to keep everything cold.
If you are moving your refrigerator or freezer into storage, you will need to empty and turn off your appliances at least 48hrs prior to moving them and leave with the doors ajar so that it can settle down to room temperature.
Leave the appliance switched off until they are defrosted, then remove all shelves, trays, and drawers and properly clean with hot, soapy water. Your fridge and/or freezer should be dried and free of moisture. After 48 hours, they should then be closed to protect the seals.