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AT&T claims iOS 27.0.1 fixes iPhone 18 Pro Max cellular issues, but users disagree [U]

9to5Mac • October 2, 2026 • general

Key Points:

Since the launch of the iPhone 18 Pro Max, some AT&T customers have reported connectivity issues, including inability to complete calls, texts, and data usage, with the phone showing "SOS" in the status bar.
AT&T has advised affected users to update their devices to iOS 27.0.1, but early reports indicate that this update does not resolve the connectivity problems.
The connectivity issues seem to be limited to the iPhone 18 Pro Max, which uses a Qualcomm modem, while the iPhone 18 Pro with Apple's C2 modem remains unaffected.
AT&T is working with Apple to address the problem, and Apple has also released an AT&T carrier settings update, though no official fix for the connectivity issues has been confirmed yet.