I’ve had a lot of problems with phone connectivity since getting new hearing aids. What happens is calls cut in and out randomly, not location dependent, not reception (number of bars) dependent, not battery dependent. The people I am talking to hear me fine but I just hear a chopped up conversation. After lengthy searches on the internet and the help of my audiologist I think I finally found the solution and wanted to share it as I have been very frustrated with the problem. I had trialed Widex as well recently but the problem was even worse with those.
So the solution is
iPhone go to settings > cellular > cellular data options > data roaming off, voice & Data > select 4G
For some reason LTE switches while using this selection to the “best option” but it ends up making the call cut out problem worse. Since doing this a week ago I’ve had no further problems despite looking for a fix for several months.