Samsung Galaxy S GT-I9000

1st method

  • Power off the phone or remove the battery and reinsert it
  • Press and hold Volume Up + Home Button
  • Keep pressing these 2 buttons and press Power button for 2-3 seconds
  • Release only power button and keep pressing the other 2 buttons
  • With Volume down select wipe/factory reset and press power button
  • Select Yes and press power button
  • Go Back, select reboot and press power button
Samsung Galaxy S GT-i9000 Hard Reset
Samsung Galaxy S GT-i9000 Hard Reset

2nd method

  • Power off the phone or remove the battery and reinsert it
  • Press and hold Volume Up + Volume down
  • Keep pressing these 2 buttons and press Power button for 2-3 seconds
  • Release only power button and keep pressing the other 2 buttons
  • With Volume down select wipe/factory reset and press power button
  • Select Yes and press power button
  • Go Back, select reboot and press power button
Samsung Galaxy S GT-i9000 Hard Reset
Samsung Galaxy S GT-i9000 Hard Reset

3rd method

  • Power on the phone
  • Go to Settings -> Privacy -> Factory Data Reset -> Reset Phone -> Erase Everything
  • Insert your pattern or phone lock code if asks