The pulling down a list to refresh is now one of the best known functions in many iOS apps. That while it is still not possible to do this in Apple's own apps. Designer Dustin Curtiss thinks he knows why : the pull to refresh patent is owned by Twitter , which got him after they took over Tweetie. Apple probably wants no patent case with Twitter risking.
Tweetie was the first iPhone app that made use of pull to refresh. Subsequently, the developer of the app acquired by Twitter and the app renamed Twitter for iPhone. Although a patent on the idea was completed, many developers did this not against the idea still in apps to implement. Meanwhile make apps like Facebook Tweetbot and frequent use of.
Apple would be possible to have chosen because of the patent itself does not pull to refresh use. The company has itself a number of patents for certain interface features in IOS. Apple would of course also choose to license the patent to take on Twitter.
Is your iPhone jailbroken, you can simply use it to pull refresh in a number of Apple apps. To add the tweak Pull to Refresh for Mail in the BigBoss repository the possibility to Apple's default mail app.