HT204308: Find the serial number of your Apple hardware product
Learn about Find the serial number of your Apple hardware product
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Jun 19, 2015 6:40 AM in response to alaaakkaryby anypats,If you go to Settings | General | Software Update and it shows that you are up to date then you have an iPhone 4. If you have an iPhone 4s then you should see the option to upgrade to iOS 8