Fog on left upper corner of my iPhone
When I used my Apple Pay to pay for my gas after I noticed a fog over left upper corner of my phone how I can’t see the time!!
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Based on what you described, it may be possible that some form of liquid entered into your phone ... or has entered previously and is causing the "fog" on the inside of the display.
If this is the case, then continued use of the phone has the potential of causing damage. It is totally up to you, but I would suggest that you make a Genius Bar appointment at your local Apple Store or Apple Authorized Service Provider to have them take a look and provide you with your options.