AT&T sent a warning to some iPhone 18 Pro Max users in the USA that there may be disruptions in calls, text messages and mobile data connections. MacRumors published the operator’s message to customers. This development also brings to the fore the question of which devices the problem affects, as we consider the modem of the iPhone 18 Pro Max, which varies depending on the country. AT&T wants users to upgrade to iOS 27.0.1 immediately; However, it has not yet been confirmed that the update fixes all connectivity issues.
AT&T’s message states that some phones may not be able to complete calls, messages or data transactions. The warning also covers the US emergency number 911. This statement shows that the connection problem is not just about slow internet. Still, the operator did not disclose the number of affected devices and the technical cause of the problem. Therefore, it would not be right to extend the warning to all iPhone 18 Pro Max models.
According to user notifications reported by MacRumors, the connection is interrupted intermittently on some devices, and on others the phone goes into SOS mode. In this case, users cannot receive normal calls, messages and data services over the AT&T network. The site writes that some affected people are reporting the same glitch after installing iOS 27.0.1. Therefore, AT&T’s call for an update should not be read as a definitive solution to the problem.
There is no specific fix for AT&T connection in the release notes shared by Apple for iOS 27.0.1. The update focuses on a Face ID issue on iPhone 18 Pro models. In addition, Apple talks about the new generation C2 cellular modem system in the promotion of iPhone 18 Pro and Pro Max. The modem layout of the Pro Max model sold in the USA is different from other markets; However, the available information is not enough to show the modem as the cause of the connection failure.
Update recommendation does not mean the problem is over
Users who want to follow AT&T’s recommended path can check whether iOS 27.0.1 is available on their devices from Settings > General > Software Update. Apple recommends backing up important data before installing software. If the connection problem persists after the update, contacting the operator and Apple support channels is a more appropriate step to verify the status of the affected line. AT&T’s message also directs customers with questions to these two organizations.
On the other hand, it should be noted that the incident does not mean a direct malfunction warning for iPhone 18 Pro Max owners in Türkiye. The issue described relates to some devices on AT&T’s US network. Neither Apple nor the carrier has yet shared a detailed technical explanation regarding the root cause, scope, and permanent solution. Until new information is available, it should not be assumed that all connection services, including emergency calls, are affected in the same way on every device. Users should check their connection status in advance if they need an emergency call.