Cochlear Implants vs Cell Phones

sligett thought this was worth mentioning said
6

I’m gathering information for a relative who has cochlear implants. She asked me to find out which cell phones are most compatible with cochlear implants. I’ve read about M4 and T4, and that different frequencies may work differently, and that using speaker-phone mode is a way to go.

So I’m now looking for first-hand experiences from people with cochlear implants and cell phones. If you have such experience, would you share? Phones that work, or don’t work (with which carrier?). Thank you.