I have a Verizon HTC Trophy. I used the .edu process to obtain a membership and I can connect my phone and Register it. Now how exactly do you Jailbreak/Unlock it, and how do you install a homebrew app?
There are 2 tools in your SDK they are the Windows Phone Developers Registration tool and the application development tool. First use the registration tool to register your device. Plug your device in make sure it is connected through Zune. Open the tool make sure the phone screen is on and the phone is unlocked then run the tool. To side load an app use the app dev tool you must first have an app they are in .xap forum. With the xap on your PC phone plugged in as described above run the app dev tool locate the xap and tap deploy. There ya go.