This entry is to continue the story after you unlock your Windows Phone 7.5, you may or may not have the activation code from Microsoft but it is best to know how to unlock and how to sideload xap app to your windows phone. There are alot of 3rd party Xap applications in market where you can download and sideload to your WP with steps below. it work perfectly with my HTC HD2 Windows Phone 7.5 Mango Check it out after the break.
How to Jailbreak & Sideload XAP on Windows Phone 7.5 Mango?
1. Follow step here to unlock your WP7.5.
2. Download Tom Xap Installer.
3. Extract the executable file from the zip files.
4. Execute the file. You will see box below.
5. Select any XAP files you wish to sideload by clicking “Add XAP files”
6. “Finished Install” and complete.
Happy with your sideloaded app? ^^