It's your choice
People who have difficulty hearing over the phone often look to their hearing aids for help. If your Adapto hearing aids have a telephone switch or 'T-coil', this feature can make it easier to understand telephone conversations.
The Telecoil is a small flip-switch on the back of a Behind-the-Ear style, or a push-button on the outside of an In-the-Ear style.
By activating the Telecoil you can disengage the microphone from picking up sounds around you that might distract you from hearing on the phone.