iPhone 18 Pro Max cellular failure on AT&T requires device replacement

Some iPhone 18 Pro Max owners are hit by an AT&T cellular issue that blocks calls, texts and mobile data. Affected units must be replaced since no software update can fix them. Apple released iOS 27.0.1 to prevent recurrence, and neither Apple nor AT&T has explained the cause.

• The issue blocks calls, SMS and cellular data on iPhone 18 Pro Max
• Affected units cannot be fixed by software and must be replaced
• Apple shipped iOS 27.0.1 to prevent the problem from recurring
• Complaints on Apple Support Community number in the thousands