I think most carriers have to have cell phones for the hearing impaired. There was something in one of the forums about this. Try a search for it here and see.
Also I have an Audiovox 8610 and it has a speakerphone. I know someone that has a hearing aid, and they would be able to hear the other person talking on the speakerphone.
You might want to take the person along and visit a carrier and see what they have to offer. Don't comit yourself until you are sure what plan the person wants.
A friend is hearing impaired. Uses digital hearing aids. She wants to buy a cell phone. I said I would help her.
Can anyone give me advice or suggestions as to which to buy for this situation?