Apple Inc. is not only doubling down on the iPhone X, it's tripling down.

The world's most valuable company plans to soon launch three new phones that keep the edge-to-edge screen design of last year's flagship, according to sources. The devices will boast a wider range of prices, features and sizes to increase their appeal, said the people, who asked not to be identified discussing unannounced products.

However, none of the three iPhones will be wholly new designs like the iPhone X last year or the iPhone 6 in 2014, with some inside Apple labeling the launch as an "S year," a designation the company has given to new handsets that retain the previous design but add new internal features. The company is planning more significant changes for next year, they added.