Apple has acknowledged that a small number of iPhone 18 Pro Max users on the AT&T network are experiencing problems with their devices losing cellular service, resulting in the inability to make calls, send texts, or use data. Reports from thousands of users have surfaced on the Apple Support Community and various platforms.
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To address this issue, Apple released iOS 27.0.1 earlier this week and a carrier settings update specifically for AT&T users, which will automatically download over the next 14 days. Users are encouraged to install iOS 27.0.1 by navigating to Settings, then General, and selecting Software Update.
In a statement to MacRumors, Apple advised all affected users to update their devices promptly. The statement also highlighted that iPhone 18 Pro Max devices impacted by this cellular issue cannot be restored through a software update alone; they must be replaced. Affected customers are urged to reach out to Apple Support, AT&T, or visit an Apple Store or AT&T location.
Apple clarified that this issue appears to be exclusive to iPhone 18 Pro Max devices on AT&T, with no other iPhone models or carriers reported as affected. While the specific cause of the problem has not been disclosed, it is noted that U.S. models utilize Qualcomm's Snapdragon X80 modem, while international versions feature Apple's custom C2 modem, raising questions about whether this modem difference contributes to the issue.
As of now, it remains uncertain if Apple will establish a dedicated service program for this problem, but it is expected that Apple Stores will replace affected devices at no charge. Customers are advised to book appointments at the Genius Bar if necessary.