Use earpieces or a headset to talk on the phone
It usually happens to busy people who get multiple calls throughout the day and need to stay on the phone for hours with a client or business partner. The problem is that keeping the phone on your head for hours will increase the chance of tilting your head for extended periods.
The solution to this problem is probably using earpieces connected to your phone or a headset instead of carrying your phone in your ear all day. Nowadays, Bluetooth devices connected to your phone are extremely common and convenient.