Samsung is betting that consumers want even bigger cell phone screens and has found a way to deliver that. The South Korean tech giant showed off a new phone with a foldable screen at a developer's conference in San Francisco on Wednesday. The screen size doubles to almost the width of a tablet with a 7.3 inch display when it's open, but it is the size of a typical phone when folded. It is hoping developers can create apps to take advantage of the additional space. The company did not say when the phone would be released or how much it will cost.