Troubleshooting How do I add a device to my Philips Avent uGrow App? The uGrow app can be connected to the Philips Avent Smart Ear thermometer. Find out how. Step-by-step instructions To connect the thermometer to the app, tap the settings icon in the top right menu and follow the instructions in the uGrow app. Enable connectivity For devices connected via Bluetooth, make sure that you keep your mobile device close to the device, and that Bluetooth is switched on. So it's easy for a Bluetooth connection to be made.