The first group of hearing aids* uses the cellphone microphone (or an extra device) to speak. The second group (currently only one) uses one of the hearing aids as a microphone.
List of Hearing Aids with MFi/BLE/iPhone connectivity:
- Bernafon Zerena
- Kirkland Signature 8/KS8
- Oticon Opn
- Signia NX
- Resound Enzo2, Enzo 3D, LiNX 2, LiNX 3D
- Starkey Halo2, Halo iQ
- Widex Beyond
List of Hearing Aids with direct-to-cellphone connectivity:
- Phonak B90 Direct, Phonak B70 Direct, Phonak B50 Direct, (hear phone in one ear, the other hearing aid is used as a microphone for the phone call)
*The list of hearing aids omits secondary brands with the exception of secondary brands that are carried at Costco (making them more popular).