Hm. I don’t have T-coil in my Phonaks cuz I didn’t want that limiting my options for a phone. I thought T-coil required magnetics in the phone’s receiver. I’m no engineer, but that seems like a technology from the '70s? Do even cell phones of today have some kind of T-coil electronics built in?
There was a discussion on Phonak’s Acoustic Phone vs Duo Phone here, but don’t quiz me on it!