AT&T mobile share data with unlimited text and talk for iPhone and iPad?

I have an individual wireless plan on AT&T for my iPhone 5 with 3 GB data, texting, and 450 minutes. I'm going to buy an iPad with Wi-Fi and 4G and I want to share the data with my iPhone, increasing the data to 4GB. With the AT&T mobile share data with unlimited talk and text, is my estimate correct according to http://www.att.com/...VS2leo5Gu2 that my bill will be $120 for 2GB on the iPhone and 2GB on the iPad plus talk and text?

Do you honestly believe that there won't be any hidden fees? Att gets rich off people manipulating people thinking they are going to pay a certain price.

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