Will they ever make a cellphone that's hearing aid "compatible"?

I am now using my 5th cellphone, in hopes i can hear better with my hearing aids. For some reason unknown, cellphones and hearing aids do not mix. i have made every effort to make different cellphones work with my hearing aids, but to no avail. I still have to answer and talk on a cellphone, without my hearing aids. This is a big safety hassle, especially when driving and answering my cellphone at the same time. The speaker feature is also of no help, especially in a car. I am open for any suggestions. Question: Are you aware of any cellphone that is hearing aid compatible?