A method for selecting audio input (48, 49) from a microphone of a hearing device worn by a user or a microphone of a mobile device, when the user of the hearing device is using the mobile device for performing a telephone call, the method comprising: detecting proximity between the hearing device and the mobile device, wherein proximity between the hearing device and the mobile device is detected from a received signal strength and/or a signal strength loss of a radio transmission link between the mobile device and the hearing device, wherein the radio transmission link is used to transmit data and/or audio signals between the mobile device and the hearing device and wherein proximity between the hearing device and the mobile device is detected by comparing the signal strength and/or signal strength loss with a threshold; receiving an audio input with the microphone of the hearing device and generating a hearing device audio signal from the audio input with the hearing device; determining a signal-to-noise ratio of the hearing device audio signal; if proximity between the hearing device and the mobile device is detected and the signal-to-noise ratio of the hearing device signal is smaller than a further threshold: receiving an audio input with the microphone of the mobile device and generating a mobile device audio signal from the audio input; transmitting the mobile device audio signal from the mobile device into a communication network; if proximity between the hearing device and the mobile device is not detected: transmitting the hearing device audio signal from the hearing device to the mobile device via the radio transmission link; transmitting the hearing device audio signal from the mobile device into the communication network. detecting proximity between the hearing device and the mobile device, wherein proximity between the hearing device and the mobile device is detected from a received signal strength and/or a signal strength loss of a radio transmission link between the mobile device and the hearing device, wherein the radio transmission link is used to transmit data and/or audio signals between the mobile device and the hearing device and wherein proximity between the hearing device and the mobile device is detected by comparing the signal strength and/or signal strength loss with a threshold; receiving an audio input with the microphone of the hearing device and generating a hearing device audio signal from the audio input with the hearing device; determining a signal-to-noise ratio of the hearing device audio signal; if proximity between the hearing device and the mobile device is detected and the signal-to-noise ratio of the hearing device signal is smaller than a further threshold: receiving an audio input with the microphone of the mobile device and generating a mobile device audio signal from the audio input; transmitting the mobile device audio signal from the mobile device into a communication network; receiving an audio input with the microphone of the mobile device and generating a mobile device audio signal from the audio input; transmitting the mobile device audio signal from the mobile device into a communication network; if proximity between the hearing device and the mobile device is not detected: transmitting the hearing device audio signal from the hearing device to the mobile device via the radio transmission link; transmitting the hearing device audio signal from the mobile device into the communication network. transmitting the hearing device audio signal from the hearing device to the mobile device via the radio transmission link; transmitting the hearing device audio signal from the mobile device into the communication network.