iPhone X (Pronounced "Ten") marks the device's tenth anniversary, with "X" being the symbol for "ten" in Roman numerals.
The iPhone 8 is the eight generation of the Apple smart phone device. This comes with wireless charging facilities and increased water and dust resistance.
The iPhone 7 and iPhone 7 Plus introduces new colours, water and dust resistant models. Pure successor to the iPhone 6 and iPhone 6s.
The iPhone 6s and iPhone 6s Plus have a strengthened chassis and an upgraded system - on - chip. It also introduces a new hardware feature know as "3D Touch"
The iPhone SE serves as a successor to the iPhone 5s. It includes hardware upgrades from the larger iPhone 6s model.