Apple and AT&T Have Yet to Explain Cause of iPhone 18 Pro Max Issue
Apple has stated that iPhone 18 Pro Max users experiencing AT&T cellular service failures require device replacement, as the issue cannot be resolved via software updates. Both Apple and AT&T have not yet disclosed the specific cause of the problem, though it is limited to this specific model on the AT&T network. Users who have not encountered the issue are advised to install iOS 27.0.1 and the latest carrier settings update to prevent potential connectivity problems.
- ▪Apple confirmed that affected iPhone 18 Pro Max devices must be replaced because the AT&T connectivity issue is not fixable with a software update.
- ▪The problem is currently isolated to iPhone 18 Pro Max units operating on the AT&T network, with no other models or carriers reported to be impacted.
- ▪Apple released iOS 27.0.1 and a carrier settings update to help prevent the issue from occurring in devices that have not yet experienced the failure.
- ▪U.S. models of the iPhone 18 Pro Max use Qualcomm's Snapdragon X80 modem, while international versions use Apple's custom C2 modem, though it is unclear if this hardware difference is related to the issue.
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| Original publisher | MacRumors |
| Canonical URL | https://www.macrumors.com/2026/10/05/apple-att-yet-to-share-cause-of-iphone-issue/ |
| Publication time | Mon, 05 Oct 2026 21:10:15 +0000 |
| Retrieval time | 2026-10-05T21:10:43.132Z |
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Apple and AT&T Have Yet to Explain Cause of iPhone 18 Pro Max IssueMonday October 5, 2026 2:10 pm PDT by Joe RossignolIn a statement shared with MacRumors on Friday, Apple said that iPhone 18 Pro Max users who have experienced an issue where AT&T cellular service does not work will need to have the device replaced, as the issue apparently cannot be fixed with a software update once it has occurred. That is a big deal, as it hints at hardware failure, but we lack details since Apple and AT&T have yet to disclose the underlying cause of the issue. A spokesperson for AT&T directed us to Apple, which has yet to respond to our latest request for comment.
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