NO - the manufactures install the T-coil in the hearing aids. The audiologist only turn them on if the aids have them inside the aids. If the aids don't have the small wire inside them - then the person with the aids needs to find another device that can take the place of the 'missing' wire that was not added to the wiring inside of the aid. Remember, your hearing aids are mini-computers. Just like your PC or laptop - these micro hearing aids are separately made by around 50 people on an assembly line - putting all of the individual pieces together - configured to your specific hearing loss. That is why you need to take care of your pricey hearing aids and that is why they do all of the various wonders that they do. However they still do not copy what our natural ears do in the real world.