Reports published today point to an iPhone 18 Pro Max AT&T connection problem affecting some new U.S. handsets. Owners describe failed eSIM activation or a phone that cannot hold a cellular connection for calls, texts, and data. The number of affected devices remains unclear, and neither Apple nor AT&T has identified a cause.
What owners are reporting
The complaints describe two related symptoms. Some buyers cannot complete AT&T eSIM provisioning after setting up the device. Others finish activation but then lose service. In both cases, the practical result can be the same: the phone may show no usable mobile network despite an active plan.
MacRumors collected reports from its forums, Reddit, and Apple’s support community on September 25. Those reports establish that people are encountering a problem. They do not establish how widespread it is. There is also no confirmed software or hardware diagnosis yet.
Why the U.S. model is drawing attention
The U.S. iPhone 18 Pro Max uses Qualcomm’s Snapdragon X80 modem. Apple uses its C2 modem in Pro Max units sold elsewhere, as well as in the smaller iPhone 18 Pro and iPhone Duo. That difference has prompted speculation, but it is not evidence that the X80 causes the AT&T issue. Carrier provisioning, account configuration, or software could also be involved.
Apple’s modem relationship is separate from its patent arrangements. Our report on Apple’s renewed Qualcomm patent licence explains the wider business context, while this outage report concerns customers trying to activate service today.
Steps worth taking before a replacement
Check activation status with the carrier
If your new phone has never connected, ask AT&T to confirm that its eSIM profile is provisioned for the correct device. Keep your previous phone available until the transfer completes. Do not erase a working eSIM or reset the new phone unless carrier support asks you to; that can make troubleshooting harder.
Record what fails
Note whether calls, messages, and data all fail, or whether only one service drops. Record the time, location, iOS version, and any message displayed during activation. These details can help AT&T or Apple support distinguish an account issue from a device issue.
Apple is testing iOS 27.0.1, according to the same September 25 report. A release is expected soon, but Apple has not said that it will address these AT&T complaints. For now, owners should treat any claimed fix as unconfirmed and watch the update notes and carrier guidance.
