In short if you own the 4″ iPhone 4s you won’t be able to install this update, but that said its a 5 years old device that could be easily phased out by now.

Do make a note that this is available to a limited few compatible devices, that you need to first verify and then proceed. To get started you need to head over to the Apple’s developer Program website and begin the download of the iOS 10 firmware. If you own an iPhone, iPad or an iPod touch you can also download the iOS 10 beta 1 update on your phone. You can find the list of devices compatible with iOS 10 Beta here. Here are a few major devices that are compatible with this update Apple iPhone 6s, 6, Plus, SE, 5s, 5c, 5, iPad, iPod. Nonetheless, the iOS 10 that was announced is already available to the developers who can install it and also ensure their applications are compatible with the same. At this year’s event, Tim Cook had announced some amazing numbers around the App Store including a total of 2 Million Apps & a total of 130 Billion downloads to date.

Apple had announced the iOS 10 today at the WWDC event that is held every year with thousands of developers joining the event.

Ios 10 beta profile