Text Messaging?

I have an alltel wireless phone but i'm not sure what texting plan I have.

I am not the manager of the bill so i can't access information on it. I know we have a plan, but I'm not sure what the restrictions are. I know we pay $9.99 a month of 750 text/pic/video messages and the additional messages are $.15 each. But i can't find anything else on this plan, like if it includes unlimited Mobile-to-Mobile or unlimited My Circle Messaging, which is what I really need to know.