Apple confirmed a connectivity defect affecting a subset of iPhone 18 Pro Max units on AT&T that can cause devices to lose cellular service entirely, showing “SOS” and preventing calls, texts, and data. Apple pushed iOS 27.0.1 and a carrier settings update intended to prevent unaffected phones from encountering the problem; those updates will download automatically within two weeks or can be triggered manually. Crucially, software cannot restore service on phones that have already lost it - Apple says affected units require hardware replacement and advises contacting Apple Support, AT&T, or visiting a store.
Reports from readers and forums narrow the fault to the U.S. iPhone 18 Pro Max on AT&T rather than other carriers or the regular 18 Pro. The distinction aligns with the Pro Max using Qualcomm modems in the U.S. while other Pro models use Apple’s C2 modem, suggesting a modem-network compatibility issue between Qualcomm’s baseband and AT&T’s network. The problem is not universal across all AT&T Pro Max units but appears more common than a handful of isolated cases. It remains unclear whether MVNOs running on AT&T’s backend are affected, and the situation is notable for requiring device replacement once service is lost despite preventive software updates.
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