Enabling Emoji without app

1. SSH into your iPhone and navigate to :
/private/var/mobile/Library/Preferences/com.apple.Preferences.plist
2. Edit it using a PLIST Editor
3. Replace all text inside com.apple.Preferences.plist with this:

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>KeyboardAutocapitalization</key>
<integer>1</integer>
<key>KeyboardAutocorrection</key>
<integer>1</integer>
<key>KeyboardCapsLock</key>
<integer>0</integer>
<key>KeyboardEmojiEverywhere</key>
<true/>
<key>KeyboardPeriodShortcut</key>
<integer>1</integer>
<key>UISuspendedSettings</key>
<dict/>
</dict>
</plist>

 4. Save your com.apple.Preferences.plist
5. Go to Settings
6. Select Keyboard and go to international keyboard
7. Select add new keyboard and select Emoji from the list.
P.S.- Emoji also available at my cydia repository