The Apple serial number is not just a string of digits and letters. It reveals a lot of information about device, you can’t obtain other way.
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What does an Apple serial number tell you? - Quora
Apple FAQ - Everything You Want to Know About Apple
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Apple Serial Number: Why Is It Important
MacOS image reports invalid serial number · Issue #1400 · actions
Apple Serial Number: Why Is It Important
Apple Serial Number: Why Is It Important IGotOffer, 60% OFF
What does an Apple serial number tell you? - Quora
Most Expensive Products Apple Has Ever Sold