LIKE JUDY MARTIN says....Use you t-coils in your devices always. And if you don't know if you have them - then as Dr Juliette Sterkens, our National HLAA Hearing aid/Hearing Loop Advocate says - ask your audiologist to turn them on. If they look at you with a blank stare...just stay quiet and watch them until they say something to you. They will either say YOU do not have t-coils in them or that she/he didn't order them with the t-coil in them because they figured you didn't need them. Not a good thing for you. They made a judgement call on your behalf which was NOT A GOOD THING. In this case, they need to rectify the problem and correct it for you. You always need t-coils and they will need to give you hearing aids with coils in them so you can HEAR ON YOUR CELL PHONES which is one of the purposes of the coils. Of course there are some aids that are too small (in the ear) to have coils in them - so that is where the assistive listening devices are used to complement the hearing aids. Check with your hearing aid dispenser to see where you can get the best hearing aid for you money's worth today and make sure the Certified AuD tells you all about the t-coil.