Remove your SD card before starting to ensure those files remain untouched. Method 1: Hard Reset via Hardware Buttons (Fastest)
Scroll down to "Yes – delete all user data" and press Power to confirm. How to Unlock SONY Xperia S LT26i - HardReset...
If you’re locked out of your Sony Xperia S LT26i (forgotten pattern, PIN, password) or need to network-unlock it for use with another carrier, here are the working methods. Remove your SD card before starting to ensure
The software will download necessary files and restore the device to its original factory state, removing the lock screen. Method 3: Google Account (Android 4.4 and older) How to Unlock SONY Xperia S LT26i - HardReset...
Press the Power button to select it.