You can still preserve the majority of your data through the syncing process.Applications are available through the i Tunes store that provide information on your i Phone’s performance, such as memory usage, system logs and cache information.
After restoring your phone, you can restore the i OS from a previous backup.
This doesn't happen usually but just in case apps get stuck at “Waiting” when you try to install or update them, there's really nothing much you can do but to cancel the download and restart it. There are certain cases where this might happen all too often.
Network, available free space and apps running the background can all play a role in this issue.
Additionally, Apple sometimes releases software updates designed to resolve freezing problems.
You can update your device by plugging it into your computer, opening i Tunes and clicking “Update” in the device summary menu.