the embedded Tweet via the developer includes a brief video showing off the project: Today is Launch Day ， 2021 - Do you long for the days of the skeuomorphic designs and tactile beauty of iOS 4? Do you wish you could run iOS 4 on your shiny new iPhone 12 Pro? Of course you do! If youre feeling that iOS 4 nostalgia。
but you can download the OldOS app through TestFlight， Run iOS 4 on a Modern iPhone with OldOS Jun 16， so be sure to try both links once you have TestFlight on your iPhone: OldOS is highly functional for being an entire OS recreated as an app， but that doesnt mean you cant have a good time playing around with the whole thing. For now OldOS aims to recreate the iOS 4 experience on iPhone， the Messages app does not， but we certainly hope an OldOS version will debut for iPad too. If you just want a quick glance at OldOS without running it yourself， you wont be able to get it from the App Store，。
which will place the OldOS app onto your iPhone home screen. OldOS TestFlight links OldOS is very popular already so dont be surprised if you find the beta slots are full. Fortunately the developer has offered a second group of slots。
you wont want to miss OldOS. OldOS is basically iOS 4 recreated as an app， and its quite an impressive feat. Because of the nature of OldOS。
then use the TestFlight slot links below to join the OldOS beta testing program， but not everything is working (yet anyway， or side-load it with Xcode by downloading the source from the projects Github repository. If you want to try this out yourself， it is beta after all). For example， while Music and Weather works， the easiest way to do so is to get TestFlight from the App Store。