Samsung Galaxy S III - Deactivating Wi-Fi; Manually Scan for a Wi-Fi Network; Wi-Fi Advanced Settings

Use a Screen Unlock PIN
1. From the Screen lock settings menu, tap PIN.
2. Enter a PIN, tap Continue, re-enter your PIN, and tap Done to save the setting.
 The screen lock is set
 If you fail to enter the correct PIN after five attempts, you will be prompted to wait for 30
seconds before you can try again.
Settings 311