Adam Kos Certainly, there is no doubt that iOS 15 will be the most advanced operating system in Apple's mobile phones in the autumn of this year, when its sharp version is released. But for those of you who do not accept the constant release of new versions, we have great news. If you want, you can download iOS 4 to your iPhones. Apple iPhone 4, introduced on June 7, 2010, is considered by many to be the most successful iPhone in terms of design. It was significantly different in appearance from its predecessors. The round back, typical of the original iPhone and 3G/3GS models, has been replaced by a sharply cut chassis that consists of a glass front and back. It came with iOS 4.0 pre-installed. The highest supported iOS version is 7.1.2.
In addition, the iOS 4 operating system was the first to get rid of the iPhone OS designation. You can now remember this iconic moment on your current iPhone models. This even if you own an iPhone with a frameless display. OldOS is an application that restores everything that was so great about iOS 4 - even the virtual desktop button is missing. Zane, the developer behind the app, created it to be as faithful to the original version as possible. It is thus a fully functional representation of iOS 4, and the developer claims that it could also function as a second operating system on the phone. Most of the applications inside OldOS are thus fully functional and work as they did years ago.
Today is Launch Day 🚀
Introducing OldOS — iOS 4 beautifully rebuilt in SwiftUI.
* 🎨 Designed to be as close to pixel-perfect as possible.
*📱 Fully functional, perhaps even usable as a second OS.
* 🗺️ Fully open source for all to learn, modify, and build on. pic.twitter.com/K0JOE2fEKM— Zane (@zzanehip) June 9, 2021
You can browse the web with the old Safari, search in the Maps app, and even listen to music with the iPod app. But some apps like YouTube and News still have some problems. However, the developer is working on them and claims to have them fully debugged soon. The app was built with SwiftUI, and the best thing about it is that it's open source. Any developer who is interested in it can create applications for its skeuomorphic interface in the style of iOS 4, which we got rid of with the Flat design in iOS 7.
How to download OldOS
You can download OldOS using the app Apple Testflight. After installing it, just click on this link, which will connect you to the OldOS beta. The number of users is limited, so don't hesitate too much. If you can't fit anymore, try another version OldOS 2 beta.
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Amaya Toman 
Interesting idea, but the developer is developing something already developed and surpassed 😉
It's about the same as if I stopped enjoying driving a Porsche, so I would buy a horse and carriage. It is de facto the same thing. There is a horse in the front, 4 wheels in the back and it goes. 😂
Plus, it's retro and a lot of people admire it.
It really is a sign of progress to go back to 12 year old stuff😂😂😉
It is already written at the beginning of this article that your comment is completely useless for people who do not recognize progress