It is nasty that you forgot the password and now you can’t unblock your Samsung Galaxy S 2. When it’s lock you can’t send or receive calls, can’t use email nor browse the internet. As a matter of fact, you can’t do anything except to make emergency call. Let’s explore at the options that you can do to get back into your device.
Hardware Key Reset
1. First turn off your device by pulling out the battery if you device is not responding.
2. Then press and hold down the volume up + volume down button, then press and release the Home/Power button.
3. From the menu options, select Clear Storage.
4. Confirm if you want to go ahead.
You could also try to use the code to reset the device
Also you could try to key in *2767*3855# and press dial.