Since I installed iOS 6 there have been many issues with my iPhone 3GS. I now have 6GB of "unknown" stuff in the iTunes breakdown, and the phone became much slower, could there be a connection between the two?
Is it possible to do a clean install of iOS6?
Best Answer
You can remove all settings and information from your iPhone using "Erase All Content and Settings" in Settings > General > Reset.
If that doesn't help you can also try the same from iTunes, see here for details.
Afterwards you can restore your data again from a previous backup in iTunes.