my iphone 4 , i forgot the pass code how ? cannot use at all

Hello S1315770G,

After reviewing your post, I have located an article that can help in this situation. It contains a number of troubleshooting steps and helpful advice concerning Passcode issues:

iOS: Forgot passcode or device disabled

http://support.apple.com/kb/ht1212

Thank you for contributing to Apple Support Communities.

Cheers,

BobbyD