Been using an app like MyWi to enable tethering on your jailbroken iPhone? Then there's a good chance you've already received a message like the one above from AT&T, or perhaps an email like the one after the break. By all accounts, the carrier is now cracking down on all unauthorized tethering, and it's asking folks engaged in such behavior to either pay up for a proper tethering plan or simply stop tethering altogether -- if it doesn't hear anything back for you after sending the message, AT&T says it will automatically enroll you in a DataPro 4GB tethering plan (at a rate of $45 a month). We should note that all the reports we've seen so far are from iPhone users, although that certainly doesn't mean Android users will simply be allowed to slip by unnoticed. Exactly how AT&T is identifying users isn't clear, however, and we could well just be seeing the beginning of a cat and mouse game as folks try to discover workarounds to go undetected. More on this one as we get it.

Update: AT&T reached out to us and, yes, this is pretty much all there is to the tale: the "small number of smartphone customers who use their devices for tethering but aren't on our required tethering plan," are being contacted to either cease and desist or prepare to start paying for the service. No word yet on how many customers have been contacted, but it does seem that they're all using iPhones.

[Thanks to everyone who sent this in]
Dear XXXXXXXX,

We've noticed your service plan may need updating.

Many AT&T customers use their smartphones as a broadband connection for other devices, like laptops, netbooks or other smartphones– a practice commonly known as tethering. Tethering can be an efficient way for our customers to enjoy the benefits of AT&T's mobile broadband network and use more than one device to stay in touch with important people and information. To take advantage of this feature, we require that in addition to a data plan, you also have a tethering plan.

Our records show that you use this capability, but are not subscribed to our tethering plan.

If you would like to continue tethering, please log into
your account online at www.wireless.att.com, or call us
at 1-888-860-6789 Monday - Friday, 7 a.m. - 9 p.m. CST
or Saturday, 8 a.m. - 7 p.m. CST, by March 27, 2011
to sign up for DataPro 4GB for Smartphone Tethering.
Here are details on the plan:

DataPro 4GB for Smartphone Tethering
• $45 per month
(this gives you 4GB in total, combining both your smartphone data plan for $25 and the tethering feature, $20)
• $10 per each additional GB thereafter, added automatically as needed
• Mobile Hotspot capabilities are included for compatible Smartphones
If we don't hear from you, we'll plan to automatically enroll you into DataPro 4GB after March 27, 2011. The new plan – whether you sign up on your own or we automatically enroll you – will replace your current smartphone data plan, including if you are on an unlimited data plan.

If you discontinue tethering, no changes to your current plan will be required.

It's easy to track your usage throughout the month so there are no bill surprises. For example, we send you free text messages when you reach 65, 90, and 100 percent of your plan's threshold. If you would like to monitor your account more closely, go to www.att.com/dataplans to learn about other ways to track your data usage.

As a reminder, our smartphone data plans also include unlimited usage of Wi-Fi at no additional charge. AT&T smartphone customers can use Wi-Fi at home or on-the-go at any one of our more than 23,000 U.S. hotspots already included in your data plan.

Thank you for bringing your account up to date. We appreciate the opportunity to continue to serve your mobile broadband needs.

Sincerely,

AT&T

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AT&T tells customers using unauthorized tethering methods to pay up or stop (update)