Sometimes a simple smiley face isn't enough to tell someone how you're feeling. That's when you should turn to the (somewhat) hidden emoji layout on your iPhone. Go to Settings, then tap General and then Keyboard. Next, select Keyboards and Add New Keyboard. Finally, scroll down and select Emoji.
Now when you're composing messages you’ll be able to add everything from a smiley face with hearts for eyes to a wineglass or a koala bear head. Just don't go overboard, OK?