Samsung Galaxy S Plus

Find "Change password"

Press Applications.

Find "Change password"

Press Settings.

Find "Change password"

Press Call settings.

Find "Change password"

Press Voice call.

Find "Change password"

Press Call barring.

Find "Change password"

Press the Menu key.

Find "Change password"

Press Change password.

Change barring password

Press Old password and key in your current barring password (default is 0000).

Change barring password

Press New password and key in a new barring password.

Change barring password

Press Cofirm password and key in the new barring password again and press Confirm.

Exit

Press the Home key to return to standby mode.