What's wrong with my iMessage/emojis?

I'm chatting with my friend on iMessage. We both have the iPhone 4S with the emoji app, but I can't see her emojis. It just reads "?=?" The text bubbles are also green instead of blue. What can I fix?

I would check if either of you have an update available for the app.

Turn on your iMessages.
Settings
Messages
iMessage "on"
And if that doesn't work
Check to see if your emoji keyboard is turned on.
Go to settings
Click general
Scroll down to keyboard
Then look and see if it says english and emoji under.
If not click "add new keyboard" and scroll down to find emoji and click it and then try to see if it works.

It is actually your phone telling you to stop using emojis and use words to express yourself

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