This function varies from network operator to network operator, please refer to the actual function.
When you are not connected to the network, you can use the voice assistant to make a phone call or open an application in the device. After connecting to the network, you can use all the functions of the voice assistant.
Press and hold for a long time, then slide up to open the voice assistant. Devices that support the front navigation key turn off the navigation bar by default, and you can swipe up from the screen to enter the voice assistant.