According to several published reports that surfaced today, AT&T is reportedly ready to begin canning the unlimited data plans of subscribers who have jailbroken their iPhones and continue to tether / hotspot off of AT&T’s no-longer offered unlimited data plans.

The folks over at 9to5Mac have been hearing from several readers who claim to have more insight into the issue that Thursday August 11th, 2011 will bring with it an end to unlimited data for those who commit the act of tethering or using their iPhone as a hotspot.  “If you use MyWi or any tethering on the phone or using the phone as a modem, AT&T will automatically change your unlimited plan to a 2Gb tethering plan for 45 dollars without the customers consent,” the article reads. “This is for those who received emails or texts about the use of tethering without an AT&T tethering plan.”

AT&T however gave the users in question a warning telling them to “stop tethering and keep their current plan” before the unlimited data plan was pulled out from beneath them. Furthermore, AT&T confirmed the report but won’t pinpoint August 11th as the definitive date for this action. An AT&T representative is quoted as saying: “Our goal here is fairness for all of our customers. This impacts a only small percentage of our smartphone customer base.”

Have any of you been warned regarding the issue? Do you think your unlimited data plan is in jeopardy? Let us know in the comments section below!