Iphone will not unlock - Apple iPhone 3G

Did you mean forgetting iPhone password? If so, you can resort to iTunes or iCloud to unlock your iPhone. Just follow below steps to do that.

How to unlock iPad screen without password with iCloud
You can also use iCloud to remove your password and recover your data if you have backed up before it was locked. And it is in the premise that you have set up Find My iPhone on your iPad, and you did remember your Apple ID, you can use iCloud to unlock your iPad.

• 1. Open your laptop or computer, go to icloud.com/find or open the iCloud app.
• 2. If the sign-in window pops up, just sign in with your Apple ID.
• 3. There's an All Devices button at the top-left of the window, click on it to call out a drop-down menu and choose your iOS device.
• 4. Click Erase (your device) in the prompt to finalize the process.
• 5. Now you can either recovery data to your device from a backup or set up as new if there isn't any back-up before.