iPhone and iPad apps have gone missing since update
Apps that have been removed from the App Store can no longer be downloaded, regardless of having been purchased or free. If you can confirm that you cannot find them in the App Store, then, sadly, this is the case.
If you performed a backup of your phone prior updating the firmware you can locate the missing apps in directory "Mobile Applications". Firstly you you have to drag and drop the needed app to your library in iTunes and after that you can drag and drop it from iTunes' Apps to your iPhone.