How to reset galaxy s2 pattern lock

If you do not have Google account, you have to perform factory reset. Resetting will DELETE ALL DATA, including downloaded applications, and reset the phone back to the state before you turned on the phone for the first time.

To perform factory reset please follow those set    
 1. Turn the power off.
2. Hold down the Volume Up, Power and Home (bottom center) buttons.
3. When the start up screen show, release all the buttons.
4. Use the Volume Up/Down button to navigate to "wipe data/factory reset"
5. Press the Home button to confirm.
Allow several minutes for the factory data reset process to complete.
6. Select reboot system now.
Allow several minutes for the reboot process to complete.

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Samsung Galaxy S1

Samsung believes that the handset “will change the way people think about smartphones.” While this may be a far-fetched statement, the Galaxy S is certainly one of this year’s best smartphones – feature-wise, at least – so I think Samsung can easily sell, say, 1 million Galaxy S units in the first week.