f you mean you cannot get your iPhone to do anything due
to having entered the incorrect code too many times, restore
using the computer you normally sync the iPhone to. Plug the iphone in your comp , open itunes
the iphone will appear i n the list at the left. Left click, restore
If you mean it will not accept any commands, hold down
the home button and the on/off button at the same time
until the Apple logo appears and then let go of the buttons.
Ignore the red power off slider when it appears.