Maurice, If you have forgotten the passcode, then it is not possible to undo it so easily. You wanted others to stay out of your phone and now you yourself have been locked out of it. See the power of passwords. Yes there is one way. You will have to reinstall the firmware on your phone. Better still, get it reinstalled from the service center as their job would be thorough. And this time no passwords. Just remember that we all tend to forget them sooner or later. All the best to you.