T-mobile galaxy s iii foxfi hotspot doesnt work

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http://forum.xda-developers.com – Hi I just bought a galaxy s iii at t-mobile amd downloaded the foxfi hotspot app. For some reason my devices see the wifi but cant connect. What could be the reason for this? I am in the new unlimited 4G plan with not t-mobile hot spot I would like to use foxfi. Can some I ne help me? Sent from my SGH-T999 using xda premium (HowTos)