Press to launch the Cydia Installer from your SpringBoard.
Press to select Sections from the tabs at the bottom of the screen.
Press to choose Tweaks from the list of Sections.
Press to select Emoji from the list of Packages.
Press the Install button at the top right of the screen.
Press the Confirm button at the top right of the screen.
Once the installation has completed successfully click the large Restart SpringBoard button.
Press the Home button then press the Settings icon on your SpringBoard.
Press to select General from the Settings Menu.
Press to select Keyboard from the General Menu.
Press to choose International Keyboards from the Keyboard Menu.
Press to choose Japanese from the Keyboards Menu
Move the Emoji switch to the ON position.
Press the Home button then press the SMS icon to open the text messaging application.
Press the New SMS button at the top right hand corner of the screen.
Notice you will now have the choice of many emoticons to enhance your messaging.