Smartphones that roll and unfold are the next big thing, and the TCL CSOT rollable concept phone is no exception. While this concept mobile phone may never come to fruition, its design has an AMOLED rollable screen. In fact, it can expand the 6.7-inch display all the way to a 7.8-inch display. According to TCL, all of this expansion happens when you simply tap it with your finger. Designed with an adaptable user interface, this TCL rollable phone may also have a mirror-like back. So you no longer have to flip your phone camera around to apply makeup or make sure you don’t have food on your face. Impressively, this TCL CSOT rollable concept phone has a thickness of only 10 mm, and its bend radius is 3 mm.