Below are the ten useful and must know secrets which might or might not be available in the user manual of your iPhone, these spicy quick ideas and hidden unrevealed features will make the experience of the iPhone much enjoyable; And I believe that they will produce you more efficiency too, but that is secondary objective.

1. By clicking the available button on your hands free equipment, you can suspend your currently playing music. By clicking it again it will resume to your tunes and by double clicking you can bounce tracks.
2. Double press the spacebar to have a “.” (Full stop) which is trailed by space. By dragging finger of yours from 123 mode to the sentence where you need and it will insert it. It will also bring you to the QWERTY mode right away.
3. If you were near speakers or if your iPhone senses it automatically then it will ask you if you to getinto airplane mode. By this way, you can stay away from that frustrating noise.
4. With the use of quick double tap you can perform a quick zoom in and zoom out operations on your favorite photos. 
5. After you take away your finger off the screen, the text will be entered, is not when you push it.
6. By double tapping the home button which is available at the bottom the Firmware will instantly send you to your contacts menu.
7. You can alter the five quick access buttons available from the iPod controls. Go to more then Edit to have your changes done.
8. Undelete of your Visual Voicemail is also possible.
9. The requirement of the standard 3.5mm audio jack can be cured by cheapest available adapter.
10. Theft issues can be prevented by the “ruggedized rubber atrocity of a case” and can minimize the damage.