WhosHere running on Android supports emoji characters, but only if you have enabled the emoji dictionary on your Android device. And only Android devices running Ice Cream Sandwich (ICS) or later can do this.
Unfortunately, the directions for how to turn on emojii very from Android device to Android device. These instructions may work for your device - http://www.cultofandroid.com/19734/android-4-1-tip-how-to-activate-and-use-emoji-emoticons/.
If not, we suggest you consult with your carrier's technical support. You can also try finding appropriate instructions on Google - emoji on android.