If you like to use Emoji in messaging, you can set your iPhone to type Emoji with the alphabet shortcuts.
To set the alphabet shortcuts on your iPhone, follow these steps:
Go to Settings > General > Keyboard > Keyboards > Add New Keyboard >Emoji.
Go to Settings > General > Keyboard > Add New Shortcut…
Insert a frequently used Emoji in Phrase.
Insert a text in Shortcut which will be used to convert to Emoji.