The power button on an iPhone XR is typically used on a daily basis, as it is used to turn the device on and off and to put it into and out of sleep mode. It is also used to initiate a hard reset of the device, which can be helpful if the device is not responding or if it is experiencing other issues.
In addition to these functions, the power button can also be used to access the Emergency SOS feature, which allows you to quickly call for help in an emergency situation. To access Emergency SOS, you can press and hold the power button and either of the volume buttons.
Overall, the power button is an important and frequently used button on the iPhone XR, and it is essential for controlling the device and accessing certain features.