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 th
