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AT&T is warning iPhone 18 Pro Max customers to update their devices immediately as an ongoing cellular issue could prevent affected phones from making calls, sending texts, using mobile data, or even reaching 911. The carrier
Software updates should prevent iPhone 18 Pro Max devices from losing AT&T service in the future, but if it's already affected, you'll need a replacement.
iPhone 18 Pro Max AT&T call failures may be fixed by iOS 27.0.1, but some users report mixed results after updating.