Iphone 13 pro adaptive refresh rate July 8, 2019 16 32 64 128 Iphone 13 pro adaptive refresh rate settings Iphone 13 pro max adaptive refresh rate Iphone 13 pro max refresh rate Iphone 13 pro 120hz settings Iphone 13 pro max hz display How to change refresh rate on iphone 13 pro max Iphone 13 pro hertz display