When you're entering text into a note or e-mail message, you can end a sentence by going to the Symbol or Numeric keyboard and hitting the period. A faster way is to double tap on the spacebar. It will enter a period followed by a space.
If this feature does not work, you'll need to activate it by going to Settings >General >Keyboard and turning the "." Shortcut switch on. This screen also lets you turn on/off the following:
- Auto-Correction: Suggests words based on the characters you've entered.
- Auto-Capitalization: Capitalizes the first word in a sentence.
- Enable Caps Lock: Lets you tap the Shift key twice to lock it into all-caps mode; tap it twice again to unlock.