Just last week this Windows Phone 7 Unlocker tool was released. There were lots of talks were going on about it. Microsoft had also warned users from using it.
“We anticipated that people would attempt to unlock the phones and explore the underlying operating system. We encourage people to use their Windows Phone as supplied by the manufacturer to ensure the best possible user experience. Attempting to unlock a could void the warranty, disable phone functionality, interrupt access to Windows Phone 7 services or render the phone permanently unusable.”
And now the news comes this Unlocker tool has been discontinued. The developers of this tool Rafael Rivera, Chris Walsh and Long Zheng were contacted by Microsoft. Brandon Watson, Director of Developer Experience for Windows Phone 7 discussed about the ChevronWP7 unlocking tool and established a mutual understanding to enable homebrew opportunities and to open the Windows Phone 7 platform for broader access to developers and users.
“..To fast-track discussions, we are discontinuing the unlocking tool effective immediately…” said the developers.
More details here: Pursuing the future of homebrew on Windows Phone 7