OK, normally when someone says the device is frozen, that means you can do nothing, zip, nada. Can you explain exactly what you mean. What happens? It's not a freeze. What is working? Sounds like your springboard (the home screens) and lock screen are working. What happens to things that are not working? Do you mean all apps are just crashing back to the home screen as soon as you start them?
Please clearly describe the exact symptoms.