evidence: The redesigned iPhone 4 arrived on June 7, 2010 in tandem with the newly-renamed iOS 4, and marked the arrival of FaceTime video chat. Prices remained unchanged: $199 for a 16GB model and $299 for the 32GB version. It went on sale on June 24, and heralded the arrival of the first high-resolution "Retina" screen. "Once you use a Retina Display, you can’t go back," said Steve Jobs. (See launch story.) [...] Touch ID and the Home button were removed in favor of a new biometric security feature: Face ID. Face ID uses a TrueDepth camera system made up of a dot projector, infrared camera and flood illuminator. The A11 Bionic chip works in tandem with advanced depth-sensing technologies to map and recognize a user’s face to securely unlock the iPhone or make a transaction with Apple Pay. Face ID only works when a user looks at the iPhone X directly and is designed to prevent spoofing by photos and masks.