I understand people's urge to let the beauty going naked. However, samsung (and maybe other vendors) has a historic design flaw that allows dust getting into the housing of proximity sensor from the space between the side rim and the front glass (or maybe back cover).
The most prominent problem is that the ADC value of proximity sensor will go above 90, and the phone screen will turn off when you put the phone to your ear, but it will NOT turn back on when you take the phone off your ear.
It also interferes with any app utilizing proximity sensors.
What I suggest is that, even if you go naked, buy some skin protector, such as invisible shield, best skin ever, etc. Cut a small piece that covers the space between the side rim and the front glass and back cover. This way, no dust can enter the proximity sensor housing from those cracks.
The most prominent problem is that the ADC value of proximity sensor will go above 90, and the phone screen will turn off when you put the phone to your ear, but it will NOT turn back on when you take the phone off your ear.
It also interferes with any app utilizing proximity sensors.
What I suggest is that, even if you go naked, buy some skin protector, such as invisible shield, best skin ever, etc. Cut a small piece that covers the space between the side rim and the front glass and back cover. This way, no dust can enter the proximity sensor housing from those cracks.

