GoKawiilTeardown shows US iPhone 18 Pro Max still relies on Qualcomm's X80 modem
A TechInsights teardown of the iPhone 18 Pro Max confirms that the US model uses Qualcomm's Snapdragon X80 modem instead of Apple's own C2 chip, which powers the device everywhere else and in the smaller iPhone 18 Pro globally. The X80 is the same modem found in last year's iPhone 17 Pro line, meaning Apple hasn't fully extended its in-house modem rollout to this specific US model.