Not every iPhone 18 Pro Max sold worldwide is built exactly the same. As per the report from Numerama’s Nicolas Lellouche, Apple quietly revised its tech specs webpage for the newly announced iPhone 18 Pro series, outlining which regions get Apple’s own C2 cellular modem and which ones don’t.
According to that update, the standard iPhone 18 Pro ships with the C2 modem no matter where it’s sold. The iPhone 18 Pro Max follows a different path, though. Every version sold outside the United States uses the C2 modem too, but American units skip it entirely in favor of a Qualcomm chip instead. Separate digging into iOS 27’s code by a tipster known as itspdfu confirmed this, pointing specifically to a Qualcomm modem powering U.S. iPhone 18 Pro Max units rather than Apple’s in-house silicon.
Apple hasn’t offered any public explanation for the split, leaving room for speculation. One likely factor traces back to a 2023 agreement between Apple and Qualcomm, which committed Apple to buying modems from Qualcomm through 2026. Keeping at least one U.S. model on a Qualcomm chip could be Apple’s way of fulfilling that agreement at the smallest scale possible before moving fully to its own modems going forward.
The modem choice actually matters here beyond just branding. Apple’s C2 is capable of blazing fast speeds with mmWave 5G support in the U.S., something its earlier C1 and C1X modems couldn’t do. Qualcomm modems, on the other hand, have supported mmWave 5G in American iPhones going back to the iPhone 12, meaning Apple’s own modems are only now catching up to a capability Qualcomm chips already had for years. Apple has said the C2 offers noticeably faster upload speeds than the C1X while using 15% less power, giving it a real efficiency edge over Apple’s previous in-house modem generations.
Apple’s modem transition has been building gradually. In February 2025, the original C1 launched with the iPhone 16e, followed by the C1X in the iPhone Air that September, with the C2 now representing the third generation of that effort.
It’s not yet confirmed exactly which Qualcomm chip those American units use, though the Snapdragon X85 looks like the most probable candidate. Real-world performance comparisons between the C2 and Snapdragon X85 should start surfacing over the coming weeks as more people get their hands on both versions. Apple’s new foldable iPhone Duo avoids this split entirely, shipping with the C2 modem globally regardless of region.
