I just remembered the weirdest bug that used to happen with the VOIP phones we had at my last job. When the caller ID displayed for an incoming call, the 6th number in the series was always one digit lower than the number was supposed to be.
So for example, my friend would call from her house, 555-1234, and my caller ID would display 555-1224. And if that sixth number was a zero in the original phone number, it would leave a blank space, 555-12 4. It was the strangest thing.
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