If you’re a developer and looking for a better test experience than the emulator offers, then you’re in luck. The latest word coming out of a developer conference call is that any Windows Phone 7 device will be un-lockable through a special portal provided to developers. Each developer will be allowed to unlock up to 5 devices.
Unlocking the device will not remove the carriers lock, but it will remove the restrictions around applications being installed only though the marketplace. Consider this the same thing as jailbreaking your iPhone or rooting your Android device. Although, for now this is just for development purposes. I imagine it won’t take long for the community to figure out what change is being made and then provide their own lockdown removal.
Time is ticking along and we’re getting closer to the release of Windows Phone 7. While Microsoft is still saying “Holiday 2010”, it’s expected to hit around the fall. As you very well may expect, we will be keeping our eye’s on the launch and we’ll bring you all the details.
Source = Windows Phone Thoughts