The guys at GlyFX have released a free set of 5 common iPhone icons which you can use for the TabBar or Toolbar. The icons that are contained in the set are: home, feeds, update, info and a help icon. As always the quality of the iPhone icons are A+ so I recommend everyone to check them out.
GlyFX also have a tutorial on how to add the iPhone icons to your application in their support section, so if you are having any trouble i suggest you check it out.