What r u talking about?? Its crazy how so much false info is given. When u open foxfi for ur Vzw S4 or whateve, yes, a Vzw pop up emerges encouraging u to purchase their mobile hotspot. Just press home button and foxfi works again like normal.
I used 20GB last month and Im fine. I believe Vzw lost this legal battle and courts declared Vzw cant limit your unlimited data no matter what you use it for.
Re: AT&T software update disabled my foxfi hotspot
http://forums.androidcentral.com/verizon-samsung-galaxy-s4/295703-foxfi-not-working.html#post2913046
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Check out this thread. Worked for me.