iPhone 18 Pro to Split Modem Duties: Qualcomm in the US, Apple C2 Everywhere Else Leaked documents from the Tata Electronics ransomware breach reveal Apple is planning a region-based modem split for the iPhone 18 Pro, with US models retaining Qualcomm hardware while international units use Apple's in-house C2 chip. The finding comes from a bill of materials analyzed by AppleInsider after more than 630GB of data was stolen from the Apple manufacturing partner. The reason comes down to mmWave.
Apple's current C1 and C1X modems don't support the ultra-high-frequency 5G band, and leaked documentation suggests the C2 won't either. The US bill of materials lists Qualcomm components including the SDX80M, SDR875, and multiple RF chips tied to mmWave capability, per MacRumors. International models will use the C2, codenamed Ganymede.
The split adds a new layer of complexity to Apple's modem transition. The iPhone 17 lineup already uses a mixed approach, with the iPhone Air and iPhone 17e running Apple-designed modems while the iPhone 17, 17 Pro, and 17 Pro Max use Qualcomm. The iPhone 18 Pro takes that fragmentation further by making the modem choice depend on where the phone is sold.
Two separate logic board part numbers reinforce the finding: 820-04340-06 for the US variant with a mmWave connector and Qualcomm hardware, and 820-04305-06 for the non-mmWave version.
John Gruber of Daring Fireball argued the practical tradeoff favors battery life over speed. "5G mmWave is simply a waste of battery life as far as I'm concerned," Gruber wrote, adding that carrier economics likely drive the decision.
Verizon and AT&T spent heavily building mmWave networks and want flagship phones that support them. The C2 modem has been a rumored iPhone 18 Pro feature for years as part of Apple's broader push to cut its Qualcomm dependency. A split deployment with the C2 handling most global markets while Qualcomm covers the US represents partial progress, but it also means US buyers may see worse battery life than customers elsewhere.
Beyond the modem situation, the leaked documents also point to camera hardware changes. The wide sensor ID shifts from 0x903 on the iPhone 17 Pro to 0x905, suggesting the iPhone 18 Pro will use a new Sony IMX-905 sensor.
Rumors dating back to October 2025 have claimed the Pro models will feature a variable aperture rear camera. The iPhone 18 Pro and iPhone 18 Pro Max are expected to launch this fall alongside Apple's first foldable iPhone.
