@johnbflat Yes, just about every cell phone today has a telecoil. The T rating reflects that. It is an indication of how well the cell phone transmits the signal to the hearing aid so the cell phone would not be able to act as a receiver for a venue that has a loop system installed. It is confusing. For those that may not be familiar with the M and T ratings that John mentions, the range of each is from 1 to 4, with 4 being the best. An M4/T4 phone is best but it doesn't mean that anything less is bad. I think my iPhone 6 has an M4/T3 rating. I wouldn't even consider a rating less than 3.
Tony in Michigan