Reset and tried to turn on but it tells me that I need an eligible data plan to use and gives me AT&T link for online or a call now optionI have a 23% fan discount, which was only applied to the $70 for the 4GB share and that did not include a device. I was charged $40 for each of the 3 devices on my plan, which didn't have a discount.
I believe OP lucked out in error.
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Reset your network settings if you're on a Share plan. You should be able to activate it in your settings and Personal Hotspot also.