Explain the att family plan?

So I'm hopefully going to be getting an iPhone 4S and we use AT&T so my mom said we'd use the family plane. To add lines, you pay an extra $9.99. I was wondering what you all get with the whole family thing. So to my understanding, you get Internet, unlimited texting and unlimited calling. Or am I being mistaken.
No hate about the iPhone 4S I don't wanna get an iPhone 5 because their too expensive rite now

Adding a line onto a Family Talk plan you would pay 9.99 if it is a limited talk plan ie a plan with minutes. You would then need to pay for the required data plan which can run you anywhere from 20-50 a month. Messaging is likely covered at the family plan level with a family messaging plan. If you are interested in looking at the mobile share plan options check out the following link:
http://www.att.com/...t/planner/

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