Verizon no. Gsm carrier maybe but not at full speeds. Buying a phone and wanting to get it working in another carrier isn't the wisest thing to do to save money. Phones are NOT 100% interchangeable between carriers. Your friend might have bought an expensive paperweight or 2g phone.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?