Here are three useful keyboard tricks for iOS that you can use on your iPad, iPod Touch, iPhone or iPad mini.
1. Tap the space bar twice, and iPhone adds a period and capitalizes the next word.
2. To enter a number or symbol quickly, touch and hold the 123 key, then select the key you want. Lifting your finger returns you to the alphabet keyboard.
3. Touch and hold a letter to reveal a list of special characters.
For more, see the original article at the link below.
iPhone 5 Tips and Tricks | Apple