AT&T cellular connectivity failures on some iPhone 18 Pro devices

Some iPhone 18 Pro Max devices on AT&T in the United States lost cellular service, affecting calls, texts and data, including potential emergency calls. Apple said October 2, 2026, that iOS 27.0.1 and a carrier-settings update were intended to prevent further failures, but devices already affected required replacement. The total number affected, full recovery and underlying cause remained unestablished. No event-specific cyber evidence was identified.