Abstract:
In just a few weeks after Apple’s new generation iPhone 18 Pro Max was launched, more concentrated cellular network connection issues have emerged. The U.S. operator AT&T recently issued a formal warning to affected users via text message for the first time, admitting that some iPhone 18 Pro Max devices have problems with being unable to use cellular networks properly, and requiring users to immediately upgrade to iOS 27.0.1. A large number of users have reported that their mobile phones suddenly lose the mobile network, are unable to make calls or send text messages, and even enter "SOS" emergency mode.
AT&T sent a text message to users stating that some iPhone 18 Pro Max may not be able to complete phone calls, text messages or mobile data connections, including even the ability to make 911 emergency calls. Therefore, users are advised to immediately enter "Settings - General - Software Update" and install iOS 27.0.1. If you still have problems, you should contact AT&T or Apple customer service.
However, at present, iOS 27.0.1 has not solved the problems of all affected users. A large number of related complaints have been found in the Apple Support Community, Reddit and MacRumors forums, and the number of affected users has now reached thousands. After some users install the update, they still experience sudden disconnection from the network, unable to connect to the phone, unable to send text messages, and the phone enters SOS mode.
What’s more noteworthy is that Apple’s official update instructions for iOS 27.0.1 do not explicitly mention AT&T cellular network failure. This version mainly fixes the Face ID problem of the iPhone 18 Pro series. However, iOS updates will also include carrier configuration and modem-related firmware, so even if the official update instructions are not explicitly written out, it cannot be completely ruled out that it contains underlying fixes for cellular communication issues.
In fact, forum users have discovered that after upgrading to iOS 27.0.1, the modem firmware version of some iPhone 18 Pro Max has been upgraded from 2.10.01 to 2.10.04, which further shows that Apple has indeed adjusted cellular communication-related software through this system update. However, judging from current user feedback, this modification does not completely solve the problem.
This failure also has a very special hardware background. The iPhone 18 Pro Max sold in the United States is the only new iPhone model launched this year that continues to use Qualcomm’s cellular modem, while the iPhone 18 Pro and iPhone Duo use Apple’s self-developed C2 modem globally. The US version of the iPhone 18 Pro Max uses Qualcomm's solution, while the iPhone 18 Pro Max in markets outside the US also uses C2. Therefore, it is currently unclear whether the Qualcomm modem is directly related to the AT&T failure.
When the problem first occurred, some users suspected that it was an abnormality caused by the AT&T network or the eSIM activation process, because the fault was mainly concentrated in the AT&T network environment. But as more and more users report similar problems, the situation becomes more complicated. Some users said that their iPhone 18 Pro Max continued to disconnect on the AT&T network, and some reported that the phone still showed an SOS status after switching between different operators. Therefore, it is not yet possible to simply determine that the problem is entirely caused by the AT&T network.
At the same time, some AT&T users said that their iPhone 18 Pro Max always runs normally, and even think that the signal and data speed of the new phone are better than the previous iPhone. This means that the current failure will not occur on all devices, and the specific triggering conditions may be related to a combination of device, network environment, eSIM configuration, operator profile and modem software.
At present, Apple has not publicly confirmed the specific cause of this problem, nor has it made it clear whether it is a software failure or a hardware failure. If it is ultimately confirmed that it is a software or operator configuration problem, then subsequent iOS 27.0.2 or other operator configuration updates are expected to further solve it; but if the investigation finds that there are hardware-level defects, the situation will be more complicated, because this means that replacement of the device or even hardware repair may become necessary measures.
Some users who have gone to Apple retail stores for help said that Apple staff will arrange to replace the device, but they also remind users that the newly replaced iPhone 18 Pro Max may not completely solve the problem, because if the root cause exists at the software or network compatibility level, replacing the same model of device may still encounter the same fault.
At present, AT&T has at least officially acknowledged the existence of the problem and upgraded it to a network failure that requires users to pay attention. Compared with previous users reporting problems on forums and social platforms, this means that operators have begun to take clearer handling measures. However, requiring users to install iOS 27.0.1 does not mean that the problem has been solved. At this stage, it is still necessary to wait for Apple and AT&T to further determine the root cause of the fault and launch subsequent repair solutions.
Comments