South Korea's No. 2 tech player, LG Electronics Inc., said Tuesday it plans to apply its latest "Knock Code" feature to its earlier devices, further promoting its new unlocking technology. The company said the feature, first introduced in February with the launch of the 5.9-inch phablet G Pro 2, will also be available for the G2 and the G Flex models through updates, and will gradually expand to other previous lineup as well.