[Q] Just Rooted but still no wifi

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http://forum.xda-developers.com – Hello everyone, Im kinda new to all this So i just decided to root my phone for the free wifi tethering to my laptop...I havent installed any custom rom just stock rooted with S-On(dont know if that matters).Ive used the Wifi tether app from the google market it connects but it takes me to the t mobile website asking me to add wifi tethering to my plan. so i tried other wifi apps from the market like open garden and barnicle but i get the same problem.I would be soo Happy if anyone can tell me a solution to this. Thank you Very Much (HowTos)