Apple Says iPhone 18 Pro Max Users With AT&T Cellular Issue Need to Have Device Replaced

Apple has announced that a limited number of iPhone 18 Pro Max users on the AT&T cellular network are encountering an issue where the device loses its cellular service, rendering phone calls, text messages, and data functionality unavailable. Numerous users have reported the problem on Apple's Support Community and other online forums.

The company recently rolled out iOS 27.0.1 and an AT&T carrier settings update to address the issue and prevent further incidents. Apple strongly recommended all iPhone 18 Pro Max users to promptly install the iOS update via the Settings app by navigating to General > Software Update. The carrier settings update for AT&T users will be automatically downloaded within the next two weeks.

To manually initiate the update, users can open Settings > General > About. Apple emphasized that devices experiencing the cellular issue cannot have service restored through updates alone; instead, the devices must be replaced entirely. Affected customers are advised to reach out to Apple Support, AT&T, or visit an Apple Store or AT&T location for replacements.

The underlying cause of the issue remains undisclosed, and it is uncertain whether the modem differences between U.S. and non-U.S. iPhone 18 Pro Max models have contributed to the problem. There is also no official confirmation of an Apple Service Program specifically addressing this issue, but Apple Store Genius Bars may offer complimentary replacements for affected devices.