The current PIN security in iPhone 2.0.2 is flawed. If you have used the "Favorites" feature in the phone, it is possible to break into the phone.
Here are the steps to do so:
- Press the Home button to wake up the iPhone.
- Slide to unlock
- Click the "Emergency Call" button on the bottom left
- Press the "Home" button two times fast. Your Favorites list will show up.
- Click on the ">" circle of a contact that has an email address tied to it
- Hit the email address to create a new email.
- "Cancel" the new email.
- You are now in the users Exchange mailbox, without knowing their PIN to unlock the phone.