TechInsights has published an iPhone 18 Pro Max teardown that confirms the U.S. version of the device is equipped with Qualcomm's Snapdragon X80 modem. The device's modem firmware had already pointed towards the Snapdragon X80 modem. The smaller iPhone 18 Pro and the iPhone Duo use Apple's custom-designed C2 modem worldwide, and the iPhone 18 Pro Max uses the C2 modem in every other country, so the U.S. version of the iPhone 18 Pro Max having a Qualcomm modem is unique.