Apple has confirmed that some iPhone 18 Pro Max owners on AT&T are losing cellular service entirely, and the phones affected cannot be fixed with any software update. The company says those devices need a full hardware replacement. If you own the $1,299 flagship on AT&T, there are two updates you should install today to keep your phone from joining them, and a clear replacement path if yours has already dropped off the network.
Here is exactly what happened, what Apple is doing about it, and the steps to take right now.
The bug: phones drop to SOS and never recover
In statements shared with MacRumors and 9to5Mac on October 2, Apple said it had identified an issue affecting a “small number” of iPhone 18 Pro Max users on the AT&T network that causes the device to lose cellular service. Affected phones show SOS in the status bar. Calls, text messages and mobile data stop working, and AT&T has warned that even emergency calls may fail in some cases.
Thousands of users had already been complaining about the issue across the Apple Support Community, Reddit and other forums before Apple confirmed it. The confusion was made worse earlier in the week when AT&T sent customers an automated text on October 1 urging them to update immediately, which led many owners of already-bricked phones to expect the update would fix them. It did not.
Apple has not explained the root cause or said how many devices are affected. What it did say is unusually blunt for the company: the two preventive updates will not restore service on phones already affected. Those units must be replaced.
Install iOS 27.0.1 and the carrier update now
Apple released iOS 27.0.1 earlier this week and pushed an AT&T carrier settings update on October 2. Apple says the two updates together are meant to stop more phones from hitting the failure. To install them:
- Update iOS: open Settings, then General, then Software Update, and install iOS 27.0.1. Apple has also started requiring iOS 27.0.1 during setup of the iPhone 18 Pro Max, so new activations are covered.
- Trigger the carrier update manually: it will download automatically over the next 14 days, but you can force it sooner. Connect to Wi-Fi, open Settings, then General, then About, and follow any update prompt that appears. The AT&T settings move from version 72.0.2 to 72.1.
Note that SOS in the status bar on its own is not a hardware diagnosis. If your phone still shows bars or 5G, install the updates first and test calls, texts and data separately with Wi-Fi off. Only if service is persistently gone should you move to the replacement step below.
Why only the iPhone 18 Pro Max on AT&T
So far Apple has only observed the outage on the iPhone 18 Pro Max paired with AT&T in the United States. No other iPhone models and no other carriers are known to be involved, and there are no indications of the issue in Europe or other regions.
The pattern lines up with a hardware split inside the lineup. The US iPhone 18 Pro Max uses a Qualcomm Snapdragon X80 modem, while the iPhone 18 Pro runs Apple’s own C2 modem and has not been affected. International models of the Pro Max ship with the C2 modem as well. Apple has not confirmed that the modem is the cause, but the split is the leading explanation among analysts and it matches the geography of the reports.
Getting a replacement if your phone is affected
If your iPhone 18 Pro Max on AT&T has already lost service, skip the troubleshooting loop. Apple advises affected customers to contact Apple Support or AT&T, or to visit an Apple Store or AT&T location to arrange a new unit. Early reports suggest stores are swapping affected units at no charge when appointments are booked, though there is no public Apple Service Program dedicated to the fault yet. Keep your eSIM details handy so the replacement can be reactivated quickly.
The awkward part of this story is the timing. The bug surfaced about two weeks after the $1,299 phone reached the market, making it the most expensive handset Apple sells short of the upcoming iPhone Duo. A hardware replacement program for a two-week-old flagship is about as bad as a launch gets. The updates cannot undo what already happened, but they should keep every phone that still works from becoming the next one.
