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First Reported C1X Modem Failure Leaves iPhone Air Without Cellular Service

Diagnostics on the affected iPhone Air pointed to a hardware-level cellular fault in Apple's first in-house modem.

Overview

  • A Reddit user known as itstheskylion reported an iPhone Air with no signal, and on-device diagnostics indicated a modem hardware failure.
  • Standard troubleshooting, including restarts, a soft reset, and a network settings reset, failed to restore service, and dual‑SIM lines on two carriers were both inoperative.
  • Coverage from Wccftech, MacRumors, and MacTrast identified this as the first known real-world issue tied to Apple’s C1X baseband.
  • There is no sign of a broader problem, as baseband hardware failures are rare, and Apple historically replaces affected units and reviews device logs for analysis.
  • The report arrives as Apple extends its in-house modems, with C1X expected in the iPhone 17e next month and a C2 chip rumored for future high-end devices.