There is a problem with the headset. According to the relevant information of the DeepBlue s103 Bluetooth headset, it is known that there is no sound when the mobile phone is connected to the DeepBlue sl03. It is because of the problem of the headset. In one case, the connection is wrong. In this case, just reconnect. In the second case, it is because of the DeepBlue sl03 headset. It's broken and needs to be repaired or replaced.