Emegency Calls iPhone

So i just got my iPhone 3G and set the passcode on the it. After I set the passcode I tried to install the 3.0 iTunes software during installation the computer prompted that I needed to enter the passcode on the phone to connect to iTunes. When I went to type in the passcode all the phone is allowing me to do is to make emergency calls. Has anyone else had this problem??? Can someone help me please??/
Gateway iPhone OS 3.0