The OnePlus Nord 4 is the first and only 5G phone with a metal back panel. This unique design is not just aesthetically pleasing, but it’s also said to improve performance by aiding in heat dissipation. We put the Nord 4 through rigorous tests, including 4K video recording, fast charging, and gaming, to see if the metal back really makes a difference in cooling the Snapdragon 7 Plus Gen 3 chip.