The HomeAssistant app can pull data from a lot of smartphone sensors but it depends on what the sensors are vs how useful they will be. I tend to use the battery level sensor on my wall mounted devices that are used as HomeAssistant controllers. This way I can turn a smart switch on and off that controls the power brick that charges the tablet. It turns on at 30 percent and off at 80.
I also setup custom dashboards for devices based on location, near a door has camera feeds for multiple cameras and controls for lights and switches nearby. Master bedroom has automations that can kill every light in the house with feeds for a front door and back door.