If you want to use those cute smilies when writing messages on your iPhone, you can. And what's even better, you don't even need to install a 3rd party app. iPhone has a built-in Emoji keyboard, all you need to do is to activate it. Here is how:
How to use the Emoji Keyboard on your iPhone
This tutorial will explain the step-by-step procedure on how to activate the built-in Emoji keyboard on your iPhone, so you can use smilies and emoticons in your messages and notes.
It will also show you how to switch between keyboards while writing and find the most used smilies.
If you have any questions or need any help with the procedure, please feel free to contact me.