How to perform a hard reset when my Samsung Galaxy S II 4G is unresponsive

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If the Samsung Galaxy S II 4G becomes unresponsive or doesn't perform as expected, you can perform a hard reset to return it to a factory default state.
Important: A hard reset will delete your data, apps and settings. It will not remove data from the memory card.
1. Before you reset the phone, turn it off then on again. This can fix some issues. If it won't turn off, remove then reinsert the battery.
2. If the phone doesn't turn on, follow the steps below to complete a hard reset.
3. Press and hold the Home button, the Volume up button and the Power button. Keep the buttons held down until the Samsung logo appears.
4. Scroll to wipe data/factory reset by pressing the Volume down button.
5. Press the Power button.
6. Scroll to Yes -- delete all user data by pressing the Volume down button.
7. Press the Power button.
8. The phone will now wipe all contents.
9. Press the Power button.
10. The phone will now reboot to the initial setup screen.