Apple says an iPhone 18 Pro Max that lost AT&T service cannot be fixed by an update. It has to be replaced. If yours still works on AT&T, install iOS 27.0.1 and the carrier settings update now.
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No Update Can Fix an iPhone 18 Pro Max That Lost AT&T
Apple confirmed on October 2, 2026 that some iPhone 18 Pro Max phones on AT&T lose cellular service, and that a phone already stuck on SOS has to be replaced. iOS 27.0.1 and a carrier settings update are meant to help prevent the problem on phones that still work. Here is what to do in each case, and what Apple has not said.