[Q] Internet sharing on unlock at&t lumia 900

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http://forum.xda-developers.com – Hi everyone! I just unlocked my lumia 900. I am currently having 3GB LTE data plan with AT&T. I thought after it got unlocked, I will be able to turn on the internet sharing without getting the 5GB data plan. But it looks like I am wrong. Can some one tell me if there is a way to turn on the internet sharing with 3GB data plan on an unlocked Lumia 900? Many thanks!! (HowTos)