AT&T warns iPhone 18 Pro Max users of call failures

AT&T is warning some iPhone 18 Pro Max users that their phones may fail to make calls, send texts or access mobile data, including calls to 911, and is urging them to install iOS 27.0.1. Customers report that the update has not consistently resolved the connectivity problems, while the cause and a confirmed fix remain unknown. The carrier’s text to customers said some phones may be unable to complete calls, texts or data and directed users to update their software immediately. AT&T also advised customers with questions to contact the carrier or Apple. The warning concerns iPhone 18 Pro Max devices on AT&T’s network; reports describe affected users experiencing lost or intermittent service. Customers posting in online support and discussion forums say installing iOS 27.0.1 did not fix their problems. Others have expressed uncertainty about whether the update helped. These accounts are anecdotal, and the reports provide no verified count of affected phones or systematic test results. The number of discussion posts does not establish how many customers are experiencing the issue. Apple’s release notes for iOS 27.0.1 do not identify a cellular-connectivity fix.