Apple is sued over unresponsive iPhone 6 touchscreens

Under fire: There are complaints that certain iPhone 6 models are not fit to be smartphones because of the touchscreen defect.

Apple Inc has been sued by owners of iPhone 6 and iPhone 6 Plus smartphones who say a design defect causes the phones' touchscreens to become unresponsive, making them unusable.

According to a proposed nationwide class-action lawsuit filed on Saturday, Apple has long been aware of the defect, which often surfaces after a flickering gray bar appears atop the touchscreens, but has refused to fix it.