You're not alone if you're experiencing iOS 10.0.2 problems, as the iPhone and iPad update has run into a number of issues, and if you've encountered any, don't panic as there are many ways to fix them.
Learn where to find your iOS device's serial number, IMEI/MEID, CDN, and There are several places to find these numbers, like in the Settings menu, on the physical device, in iTunes, or on the original packaging.