Look inside your phone’s USB-C port. You’ll see 24 pins designed for high-speed data and massive power, but buried in the spec is a mode that allows those pins to act exactly like an HDMI cable. This is HDMI Alt Mode. Announced in 2016, it allowed a simple USB-C to HDMI cable to carry native HDMI 1.4 B signals, which are up to 4K at 30 Hz, directly to a TV without any conversion chips. It was a cheaper and simpler way to connect your phone to a big screen, but it was essentially dead on arrival because it was too limited to compete with DisplayPort.