If you look on the back of your iPhone, iPad or Mac, you will see some tiny text and some symbols. There are usually just a statement of where the device was made, government regulatory numbers, and symbols from different regulatory agencies. See what can be found on a 2016 iPhone, iPad and MacBook Pro. You can use the FCC numbers to look up interesting public information about your device.
▶ You can also watch this video at YouTube.
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Something I was always curious about.
Thanks, Gary