What's the difference between the AT&T Mobile Share plans?

Recently I moved to a rural area where I need to get the mobile hot spot feature to get internet service. So I head to best buy and get MiFi and all is well. I have three Iphones on my plan and now add the MiFi feature and think that I'm saving money.

When I get the bill it shows that I'm paying for the following:

Mobile Share 10GB with Unlimited Talk and Text
Mobile Share Plan for Iphone

My question is if I'm paying for Mobile Share 10GB with Unlimited Talk and Text
AND Mobile Share Plan for Iphone?

Seems to me that they are one and the same.Am I getting railroaded by AT&T?

Any help is greatly appreciated

Added (1). Ryu - I appreciate the response and it caused me to go back and look at the bill. It appears your right on the first line but it also has a charge on subsequent lines also. Here is the breakdown:

Wireless # 1 Mobile Share Plan 10GB with unlimited Talk & Text $120
Note: this was where we added the MIfI for us all to use)
Wireless # 1 Mobile Share for IPhone $30.00
Note: This would apply to the note that they are just using details-no added cost)

Wireless # 2 Mobile Share for IPhone $30.00
Note: This does add to overall cost

Wireless # 3 Mobile Share for IPhone $30.00
Note: This does add to overall cost

As you can see I'm clearly getting charged on the two additional lines for a Mobile Share for IPhone. The total cost adds the two other line fees.

Same thing. You're not getting charged twice, they just like to be specific about what phone you use

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