my screen will not turn off half the time when I make a phone call and put my face to the phone to talk. I have to press the power button to get the screen to turn off. I tried adjusting the way I position the phone on my ear while making a call and have factory erased my phone, that doesn't fix it either. There is an issue with this phone model that needs to be addressed with a future update please. I have the USA unlocked version of the phone.