How to use my Philips speaker during a phone call? It is possible to pair your Philips Bluetooth speaker with your mobile device. Before beginning, make sure: The speaker is paired with your mobile phone General information If you want to use the Smart Sensor to end a call or receive a call, make sure the Smart Sensor is switched on. If not, press the button (indicated on the diagram) twice to switch it on. Tip: Check whether the Smart Sensor is switched on by swiping over it. It is on if there is an audio feedback when you swipe over it. To make a call Enter the phone number you want to call and press Call button on your mobile phone. A sound will be given from the speaker. To receive/end a call Move your hand towards the Smart Sensor. To speak in a call Speak towards the microphone of the speaker. Location of the built-in microphone is indicated below: Note: For some mobile phone models you need to select the speaker as the hand-free source.