i am stuck at the screen when you power on it says ' no sim card installed - insert a valid sim with no pin lock to activate iphone'
what you can do is use a jailbreak tool and that will give you access to the springboard either use limera1n or greenpois0n - Mmmm...pois0n either tool works but it wont enable phone calls you will be stuck with an ipod. tutorials on how to use the tools can be found here: iClarified - Apple News and Tutorials. if you have firmware 4.1 with baseband 2.10.04 you wont be able to unlock it but at least you will be able to install some apps and use it just not as a phone until there is an unlock tool for that baseband if its on earlier baseband and firmware you can use ultrasn0w to unlock it