So I have an iPhone 4s and it has the new updates, but the apps stopped working. When I clicked on the app it flashed on the screen but then went back to home screen. I deleted the apps and tried to download them again but when I click the download button it goes to the square in a circle for one or two seconds then goes back to the download logo. I don't want to reset my phone but I don't know what to do. Other than that, my phone is perfect and it's not slow and never freezes.
It's because iPhone 4 can't be updated to the latest iOS while most of apps require later iOS than the latest iOS iPhone 4 can be updated. You shouldn't have updated the apps before updating the iOS.