IMessage only works with certain contacts?

So I have an iphone 4 running on 7.03 and my iMessage is acting weird. My two best friends have a 4 and 4s running on 7.0 and our iMessage works perfectly. Well, my boss and coworker who both have iPhones (not sure what models or ios) but when they text me it's always as text message. I tried turning it off and back on but that didn't work. How can I fix it?

Go to setting> Messages> iMessages> send and receive> add another email or add new conversations from. From there you can add or remove the person that you want

Since yours works fine it looks like it is their settings are incorrect.

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