See character count in text messages on iOS devices
How to see the character count in text messages on your iPod Touch, iPad, iPhone or iPad mini
Here's how you can see the character count for text messages in iOS on your iPad, iPhone, iPod Touch or iPad mini.
1. Open the Settings app.
2. Tap the Character Count switch.
3. When you start typing a text message, you'll see the character account appear over the Send button.
For more, see the original article at the link below.
iPhone 5 Tips and Tricks | Apple