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One of the most compelling reasons to jailbreak, or hack, your iPhone, is to run an app called MyWi that lets you share your iPhone’s mobile internet connection without paying a monthly fee to AT&T. But now it looks like the heady days of free tethering are coming to an end.

AT&T is now sending out notification emails to subscribers using MyWi and other unofficial tethering applications, telling them their service plans will be automatically updated to AT&T’s DataPro 4 gigabyte tethering plan ($45 a month) if they continue to use free tethering apps.

AT&T’s letter doesn’t specifically mention the MyWi application, which currently costs $19.99 on the Cydia jailbroken app store, but OSX Daily has confirmed that MyWi users have received the notice.

I’ll admit, I’ve taken advantage of MyWi myself before AT&T started offering official tethering support on the iPhone last year — which required users to connect their iPhones by USB cable to share their connection. Up until this month, MyWi remained a good option, since it allowed iPhone owners to create wireless mobile hotspots to share their web access. With iOS 4.3, which was released last week, iPhone owners on AT&T can finally create mobile hotspots of their own (although notably, with fewer devices than MyWi supports).

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