Enabling The Emoji Keyboard in iOS 7?
Open the Settings app.
Tap on General.
Tap on International.
Tap on Keyboard.
Tap on Add New Keyboard.
Tap on Emoji.


To switch to it on the keyboard, tap the globe icon between 123 and the microphone icon.

I'd say that's easier than downloading a third-party anything on Android.  Plus it was included already 2 years ago with iOS 5.