You cannot completely turn off emergency calls on your iPhone, because it is required by federal law that all cell phones must be able to dial 911, even without a SIM card or a cellular plan. However, you can turn off some features that make it easier to call 911 accidentally, such as: Emergency SOS: This feature allows you to call 911 by pressing the side button five times or holding the side button and one of the volume buttons. To turn it off, go to Settings > Emergency SOS and disable Call with Side Button and Auto Call. Wi-Fi Calling: This feature allows you to make calls over Wi-Fi when cellular service is unavailable. To turn it off, go to Settings > Cellular > Wi-Fi Calling and disable Wi-Fi Calling on This iPhone. If you want to prevent your iPhone from making any calls at all, you can enable Airplane Mode, which will disable cellular, Wi-Fi, and Bluetooth connections. To enable Airplane Mode, swipe down from the top-right corner of the screen and tap the airplane icon. You can also go to Settings > Airplane Mode and turn it on.