Actually, according to the website and the person I spoke to at T-Mobile you cannot get free mobile hotspot with the unlimited data plan. You can only get the free mobile hotspot if you choose the 2gig or 500mb plans.
You can still add a certain amount of hotspot data to your unlimited plan for an additional fee (similar to AT&T and Verizon).
Jailbreak an get a mobile hotspot using tetherme or mywi problem solved
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