iPhone OS 4’s Hidden Features

Those of you who have been eagerly anticipating the release of iPhone OS 4 need wait no longer: it’s here! Head on over to iTunes and get your install on.

Now, as if the official list of new features wasn’t enough to whet your appetite, Gizmodo has compiled a list of sneaky (and awesome) hidden features that they’ve discovered through sheer usage of the new OS, together with many user submissions. You can check out the full list at the link, but some notable features include:

Updated New Contact screen: Remember how annoying it was to navigate the New Contact screen? Most of the fields displayed the green plus icon, which meant that you’d be taken to that field’s specific entry screen, which was an extra jump away from the main screen. Too many of these makes the process laborious. Well, no more — the new screen is streamlined and efficient, keeping you for the most part on the main page and focused on getting the job done.

Photo resizing after hitting Send: This is an absolutely fantastic new feature that allows you to pick the size of the photo you’re sending out via e-mail. You have the options of Small, Medium, Large, and Actual Size. Choice is always nice, but this handy addition will save you time as well.

Location Services by app: Now you can specify exactly which of your location-sensitive apps will make use of this service, which can be useful not only for protecting your privacy, but also for increasing battery life. Enable it only for the apps you deem important.

Support for long alphanumeric passwords: If, like me, you’ve always been bothered by the too-short password field in the lock screen, rejoice: iPhone OS 4 now allows the use of longer, mixed letters and numbers combinations.

There is a virtual ton of great hidden features, and doubtless there are more awaiting the adventurous user. Feel free to leave us comments with your favorites!