In this April 1, 2020, photo, a passenger holds up a green pass on their phone on a subway train in Wuhan in central China's Hubei province. Green is the "health code" that says a user is symptom-free ...
What is a QR code? A QR code (short for Quick Response code) is a two-dimensional barcode that can be read by your smartphone camera. QR codes provide quick access to product information, promotions ...
Did you know that punching select numbers on your cellphone can give you access to hidden features? If not, you’re not alone. Sometimes referred to as “secret codes,” these numbers are actually ...
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