Samsung has been rumored to be Apple's supplier of choice for an OLED foldable display and the company was said to have provided Apple with a large number of foldable display samples for testing last year, so it is unclear how the news of a collaboration with LG fits into this. Apple has used both LG and Samsung OLED displays for the ?iPhone? to date, and it is possible that the display for the long-rumored foldable ?iPhone? may be provided by both suppliers.According to the rumor mill, Apple is working on an iPhone with a foldable 7-inch OLED panel. This device could hit the market in 2023. The Cupertino-based firm has been experimenting with foldable displays since 2016, but so far this research hasn't resulted in a mass-market product.