AT&T has acknowledged cellular issues affecting iPhone 18 Pro Max devices on its network. In a text message to customers, the carrier urged immediate updates to iOS 27.0.1, despite reports from thousands of users that the update does not resolve the problem. Affected users are experiencing persistent or intermittent inability to connect to the AT&T network for calls, texts, or data, often resulting in SOS mode.
Apple's release notes for iOS 27.0.1 cite only a Face ID fix, not cellular repairs. The U.S. iPhone 18 Pro Max is the only new iPhone equipped with a Qualcomm modem, while other models use Apple's C2 chip. Apple has not publicly commented on the underlying cause.
If software fixes fail, a hardware issue would represent a larger problem. MacRumors will provide further updates as information becomes available.
Source: MacRumors · Summarized by HeadlinesBriefing