Important: On many devices, carrier services are automatically approved after inserting your SIM card. Contact your service provider if you see an error message on your device or have problems with your SIM card or carrier services. Read more about how to activate my phone/. You can set your phone to turn on Wi-Fi automatically and connect to a reliable network. This will connect your device to the nearest Wi-Fi network that you’ve used before. If Wi-Fi is turned off, you will only have access to mobile Internet.