Apple says updates can prevent new cellular failures affecting AT&T iPhone 18 Pro Max users, but they will not restore service on devices that have already lost their connection. The company is directing owners of affected phones to seek a hardware replacement.
Apple told 9to5Mac that a “small number” of iPhone 18 Pro Max users on AT&T may lose cellular service and become unable to make calls. The company did not give a device count or explain what causes the failure. It said iOS 27.0.1 and a carrier-settings update are intended to stop additional cases.
Apple released iOS 27.0.1 earlier this week and is urging all iPhone 18 Pro Max owners to install it. The separate AT&T carrier-settings update is being issued to users and should arrive automatically over as many as 14 days, Apple said. Owners can also check for it under Settings, General and About.
The software and carrier updates are preventive, not a repair for a phone already without service. Apple said the updates will not reconnect an affected device. The company advises those users to contact Apple Support or AT&T, or visit an Apple Store or AT&T location to arrange a hardware replacement.
AT&T has also contacted affected customers. Tom’s Guide reported that the carrier sent a text urging them to install iOS 27.0.1, and an AT&T spokesperson confirmed the message to the publication. The text warned that some phones might not complete calls, texts or data sessions, including calls to 911.
The statements do not suggest that all AT&T customers with an iPhone 18 Pro Max are affected. Apple described the issue as limited to a small number of users. Neither Apple’s statement nor the carrier’s comments cited by the publications provide a technical cause or a total number of affected phones.
For owners whose phones still connect, Apple’s immediate guidance is to update iOS and check for the carrier-settings update. If service has already disappeared, the update should not be expected to bring it back. Apple’s advice is to contact the carrier or Apple support about a replacement.
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