What does having mobile hotspot on a shared data plan mean?

I really want to get either the Samsung Galaxy S III or iPhone 5 on either AT&T or Verizon. I noticed that when you get a Mobile Share/Share Everything plan, the hotspot feature is free. Does using it still come out of your data amount, or is it unlimited?

You still are using your data if you turn on the hotspot feature

The data used will come out of the data plan… Its not unlimited as VErizon and ATT don't don't unlimited data "anything" plans anymore

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