tethering and rooting

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http://androidforums.com – im new to this whole rooting process but from the few of the stuff that i read, it seems to be beneficial so i am going to try to root my Inspire when i get home. maybe a dumb question from a noob so take it easy on me. so when you're phone is rooted and you have you're tethering on does that eat up your data consumption as i don't have unlimited data plan until i switch to T-mobile from ATT. As i mentioned i am new to this whole rooting thing and i just need some more in depth info. (General)