AT&T Unlimited LTE Hotspot $20 without AT&T phones

Yeah, I know. Almost impossible for the end user to know. Someone knows though. Someone always knows. My wife worked for VZW for 17 yrs. she knew about things years prior that she was under contract not to disclose until a given time. Im certain ATT has similar policies. They'll likely send out an email or letter stating that they will soon alter the TOS, thus converting the plan over to a limited plan.