Apple has issued software updates to prevent a network bug on iPhone 18 Pro Max devices, but affected users require a hardware replacement.
Key facts
- •The bug affects only iPhone 18 Pro Max users on the AT&T network in the United States.
- •Affected devices show an 'SOS' symbol and cannot perform calls, texts, or data functions.
- •Apple released iOS 27.0.1 and a carrier settings update to prevent the issue.
- •Devices that have already lost signal cannot be fixed via software and require hardware replacement.
- •Users are advised to contact Apple Support or AT&T if their device is already affected.
Apple has confirmed a technical issue causing some iPhone 18 Pro Max devices on the AT&T network in the U.S. to lose cellular service. The company released iOS 27.0.1 and a carrier settings update to prevent the bug, which renders the device unable to make calls, send texts, or access data. However, these software fixes do not resolve the issue for devices that have already lost signal.
Identifying and Fixing the Bug
Users can identify the bug if their device displays an "SOS" symbol in the status bar instead of standard signal bars. To prevent the issue, Apple recommends that all iPhone 18 Pro Max users on AT&T install the iOS 27.0.1 update via the device's settings menu. Additionally, users should check for a carrier settings update by navigating to the 'About' section within the General settings menu.
Hardware Replacement Required
For devices that have already lost cellular connectivity, software updates and restores are ineffective. Apple has stated that these users must contact Apple Support or AT&T to arrange for a hardware replacement. While the iPhone 18 Pro Max is the only U.S. model to utilize a Qualcomm modem, it remains unclear if this hardware component is related to the network failure.
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This article was independently rewritten by ManyPress editorial AI from reporting originally published by Engadget.
