Here's How to Turn Off 5g on Iphone 12. Initially Launch the iPhone's Settings app. After swiping down, select "Cellular" or "Mobile Data." Then, press the Cellular Data Options button. Manage your 5G network usage with the choices under "Voice & Data." Next, Based on your preference, select the option of your choice. You may easily manage and turn off 5G on your iPhone 12 to better fit your needs by following these steps.