Just FYI: Updating to iOS 9.3 on an iPhone requires an installed SIM card. There are some people like me who keep their older iPhones and repurpose them as WiFi only devices or as a backup phone in case the newer one stops working. Yesterday I pulled out my older iPhone 5 and updated it from iOS 7.x.x to iOS 9.2.x just to have all my iThingies running the same iOS version. I don't have a SIM card installed in the iPhone 5 as I put it in my iPhone 6 Plus when I bought it. I was able to update to iOS 9.2.x without a SIM card installed. However, when I updated the iPhone 5 this morning to iOS 9.3 the phone downloaded and installed iOS 9.3 but after it had finished and restarted, it got stuck on a screen stating that to finish the installation a SIM card was required. I was able to temporarily use the SIM card out of my iPhone 6 Plus to finish the iOS 9.3 setup. Afterwards I removed the SIM card and iOS 9.3 continues to function normally on the iPhone 5. No big deal, but just be aware that you will need a SIM card to finish the iOS 9.3 setup on an iPhone, else you will be stuck on a No SIM Card screen and not be able to use the device.