If you install

Coolsymbols (https://play.google.com/store/apps/details?id=com.pengpeng.coolsymbols)CoolsymbolsPro (https://play.google.com/store/apps/details?id=com.pengpeng.coolsymbolspro)

in galaxy S3 or S2, sometime you find some blank for emoji symbols , please update system to android 4.1 and above, then set font to default in setting. If still don't display emoji symbols please install this font ,and set font to Emoji in setting.

And if you use S4 ,please download a special font for Galaxy S4 from:[b] http://www.coolsymbols.mobi/download/EmojiFont.apk [/b]

Good lucky!