Apple releases an update for iPhone 18 Pro Max devices on AT&T to address cellular failures; units that already lost service require hardware replacement (Chance Miller/9to5Mac)

Apple has confirmed that a small number of iPhone 18 Pro Max devices on the AT&T network have lost cellular service. The issue prevents devices from making calls.

According to 9to5Mac, Apple has released software and carrier updates to prevent the issue from occurring. The iOS 27.0.1 update was released earlier in the week and a carrier settings update will download automatically over the next 14 days, or can be triggered manually.

For devices that have already lost service, Apple says a hardware replacement is required. Affected users are advised to contact Apple Support, AT&T, or visit an Apple Store or AT&T location.

Brief written by urgent.news from Techmeme, 9to5Mac — 2 reports on this story. Machine-written — may contain errors; check the original before relying on it.