Apple's tech specs for the iPhone 18 Pro and iPhone 18 Pro Max reveal a potential difference: the Pro lists Apple's C2 modem, while the Pro Max omits it for the U.S. market. Both phones feature the N1 wireless chip for Wi-Fi 7, Bluetooth 6, and Thread. The C2 modem, exclusive to the Pro, brings AI-enhanced cellular performance and supports sub-6GHz and mmWave 5G.

The Pro Max's U.S. version lacks a listed modem, possibly indicating a Qualcomm chip, though the reason remains unclear. Rumors before launch hinted some models might use Qualcomm, and supply issues could explain the split. Notably, the U.S. Pro supports Band 106, which the Pro Max does not, further suggesting different hardware.

Outside the U.S., both models may use the C2 modem. The iPhone 18 Pro starts at $1,199, and the Pro Max at $1,299, with preorders on September 12 and release on September 18.