Update: In the email AT&T do explicitly sate that if users do not contact AT&T or stop tethering, they will “automatically enroll you into DataPro 4GB after March 27, 2011”, if the user stops then no change will occur. It would seem that to be automatically upgrading/changing users contract plans, AT&T should have a fairly fool-proof method of checking which users are tethering compared to those just using large amounts of data.
Numerous AT&T users who use MyWi, a jailbreak tweak that allows you to enable tethering without a subscription, yesterday began receiving text messages and emails from AT&T reminding the users that to use your phone for tethering requires a subscription to an AT&T tethering plan.
The notices for most began with a text message that said:
AT&T Free Msg: Did you know tethering your Smartphone to a computer requires a tethering plan? Pls call 888-860-6789 for details or visit att.com/dataplans.
Following this text message many users also received an email (included after the break) which told the user that to “take advantage of [tethering], we require that in addition to a data plan, you also have a tethering plan.” The email also said if the user wishes to continue tethering to sign up to a tethering plan – but did not specify any consequences for continuing to use MyWi without purchasing such a plan.
At this point it is unclear how AT&T knows which users to issue the notices, the presumption is that the notices are going out to any user that uses a large amount of data (some are saying more than 10GB) and are not subscribed to a tethering plan.