After you read how to Unlock the phone with some of the links already provided.
Here are some usefull videos if your more of a watch and learn kinda person, and or possibly can use the added confidence of watching how to do it on a video.
This is a great site with a community of geeks and people who want to get the most out of Windows mobile. Reading the information provided by many of the people here will greatly increase your enjoyment of your device. Hope this helps.
http://video.najoomi.com/videos/te7C...2-Rhodium.html
http://thewingster.com/howflashtp2romcdma.aspx