I'm a newbie too, I have yet to debrand my phone, since its CID53. So far what I've learned about debranding is that it removes all the crap AT&T puts on it(mostly links to AT&T websites and medianet and AT&T startup/shutdown logos). And it will replace it with generic non-branded menu/applications and it also removes any restrictions that have been put on by AT&T. (same for all other service providers).