The new OS 3.0 released for the iPhone is just being explored and there have been a lot of revelations and changes which are being noted down by macrumors.com, i found these changes which were observerd by the members and noted down into one big list which is now comprising of 100+ hidden features or we can say new features/changes.

Some of the changes a re listed below:

Messages, Phone, and iPod have a new icons

• Unknown incoming calls show the location of the call

• if you start a movie/tv show on wifi. and go off the wifi network. itll finish over 3g.

• You can send as many pictures as you want in Mail. usually you can only “share” 5. this still holds true but with copy and paste you can copy as many photos as you want into the mail app.

• photos no longer turn upside down

• Podcasts are now sorted in ascending order by date/time stamp.

• When you attach a photo in mail, you can magnify it like you would text. Just tap and hold on the image.

• In one of the last iPhone OS updates Google Maps changed by default from Miles to Km in the UK and the only way to change it back was to change your region. This has now been fixed.

• When logging on to a secure website the Name of the site turns green and has a lock on it.

• messages now has its own tab in the settings along with store.

• you can close apps while they’re opening. previously you had to wait until the app was fully loaded until it would close

• when apps that play audio are closed, the audio now fades out instead of abruptly quitting.

• international keyboards are now more accurate

• Time elapsed and time remaining in songs, podcasts, etc. are now always displayed in double digits. For example it will display -02:45 instead of -2:45.

• At the end of one video podcast episode it will now play in the next episode available in the videos section of the iPod app.

• The iPod app “scrubber” now is outlined and glows when selected with little directions under it that explain what to do.

• when you bring up playback controls and hit play when nothing is playing, it will automatically shuffle your songs. previously it played them in alphabetical order.

• When the is iPhone vertical, videos played through the iPod app will fit to screen. In 2.X they always played as if the iPhone was horizontal.

• you can zoom further into photos in the Camera Roll then you could with 2.0.

• iPhone 2.2 would search your Exchange global addressbook, if you started typing a name into an email’s To: field, but now you can search the global Address book directly from your Contacts app, and get telephone numbers too!

• You can now select which folders to push from MS Exchange so you can have folders other than inbox synced

• TV Show seasons are now grouped together into one group.

• when using the camera, if you tap on the previous photo (bottom left) and go to the flimstrip, you can select “Done” to go back to the camera.

• The App Store now shows your current account on the bottom of each search page. Clicking on it will allow you to sign out or login to view/edit account information.

• When you buy something from the iTunes App, the purchase now goes into your general iTunes purchases list, instead of a specific “iPhone purchases” list.

• 3.0 has LDAP Directory support. It now searches through my company directory as I’m typing a name or email address.

• You can now type a second SMS message while the first is in the process of sending.

The whole list can be seen here Forums.Macrumors.com