Add Yahoo as a preferred source to see more of our stories on Google. What's a six-digit verification code — and why you should never share it What's a verification code, and why are they so important ...
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What the 4-digit code every commercial aircraft broadcasts actually tells air traffic control
Every commercial flight has a squawk code. Learn why there are only 4,096 codes, what 7500, 7600, and 7700 mean, and how ATC ...
, a process that helps keep your important online accounts secure. For example, you might get a text message or email with a six-digit code that you must enter when you log into your bank account.
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