How is a telecoil used to hear better on the phone?
Many people report feedback (or squealing) when they place the handset of the telephone next to their hearing aid. The telecoil can eliminate this feedback because the hearing aid microphone is turned off and the hearing aid only amplifies the signal coming through the telecoil. Telephone handsets emit the magnetic signal from the ear-piece. When placed correctly near the telecoil, the sound should be transmitted clearly. That is why some people must place the ear-piece slightly behind their ear rather than directly over the ear.
