The infamous developer unlock tool for Windows Phone, ChevronWP7 has come to an end following a mutual decision between the Chevron team and Microsoft. From the start, ChevronWP7 was an experiment with two goals: To attempt to stir up the Windows Phone beginner/hobbyist community by eliminating the cost to enter App Hub, and to convert those developers who played with Windows Phone development into published developers.
While they succeeded with the first goal, the second goal did not work out too well. And on top of this, the volume of support requests was much higher than expected. That being said, purchased tokens will cease to work. To recompense those who bought tokens for this inconvenience, Microsoft will be reimbursing them with a free one year subscription to App Hub.
Back in late 2010, Windows Phone developers Rafael Rivera, Chris Walsh, and Long Zheng embarked on a quest to develop ChevronWP7, which allows anyone to unlock their devices for the purpose of sideloading experimental homebrew applications. Following this, they met with Microsoft to collaborate on a sanctioned unlock tool, and they succeeded. They were granted 10,000 unlock tokens from Microsoft, which they sold for the low cost of $9.