Generally, this situation is more common for users of Behind-the-Ear (BTE) hearing aids because the microphone of BTE hearing aids is located behind the ear. When answering a call, you need to raise the phone slightly higher than usual and place the phone receiver on top of your ear so that the sound can enter the microphone directly for amplification. If the distance is too far, you may not hear clearly.
Alternatively, you can choose hearing aids with Bluetooth functionality, which can connect directly to your mobile phone via Bluetooth. This allows sound to be transmitted directly to your ear, so you don’t have to worry about the environment, and you can hear the phone sound clearly.