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Gizmodo recently posted a comprehensive, not to mention exciting, list of all the “secret” features they were able to find in Apple’s new iPhone operating system, OS 4. Since I don’t have OS 4 yet, I’m relying solely on Gizmodo’s list in making this post.

Without further ado, the hidden features.

“Hidden” Features

• Ability to turn cellular data on/off
• SMS character count (160 characters max)
• Ability to search SMS messages
• Web and Wikipedia search now part of “Spotlight”
• Borderless document view
• Revamped “New Contact” screen
• Events, Faces and Places in the Photo menu
• Lyrics & Podcast info toggle
• Spellcheck (finally)
• Resize photos when sending
• Create new playlists (no more of that “On-the-Go” nonsense)
• Art in Album view (cool new iPod view)
• App-specific location services
• Alpha-numeric pass codes to unlock iPhone (passwords!)
• Alerts for App folders (a little exclamation point is displayed on the folder when one of the apps inside gets an alert)
• Contact pictures in emails
• Ability to close apps while multitasking (Jobs made this a bit unclear during his Q&A session, just hold down on an icon in multitask mode to quit it)
• A new calculator icon
• Birthday calendar (compiles birthday info from contacts list)
• Smart links for dates and addresses in emails
• Double tap and hold (instead of double tap) can be bound to certain functions (open iPod, phone, etc.)
• Failed SMS notification
• Note syncing
• In-page video playback in Mobile Safari

Not So Hidden Features

• Multitasking
• Home screen backgrounds
• Camera zoom
• Game center
• Email threading
• Unified inbox
• Folders in the dock
• Bluetooth keyboard pairing

So there you have it, some pretty cool “hidden” features that will be included in iPhone OS 4, courtesy of Gizmodo. I’m sure a few more interesting features will emerge from the woodworks before OS 4 is released to the public-at-large this summer.

[Gizmodo]