The unusual part is that Apple admits the failure is irreversible in software — an admission that frames the update path as prevention, not cure. According to Gotechtor, the confirmation explains why customers who followed AT&T's instructions and installed iOS 27.0.1 still had no service afterward: the update was never designed to recover an iPhone once the failure occurred. Gotechtor also notes that Apple hasn't disclosed what causes the loss or why it appears limited to AT&T. Adding to the mystery, Macworld reports that Apple's own iOS 27.0.1 release notes never mention the connectivity fix at all, and a hardware replacement is the only remedy offered. The iPhone 18 Pro Max went on sale just two weeks ago at $1,299, per gHacks.

Thousands of complaints have piled up on Apple Support Community threads and Reddit, with users describing service dropping to SOS despite strong 5G signal. Macworld quotes one owner: 'New [iPhone 18 Pro Max] can't make or receive phone calls or FaceTime… then the phone randomly drops service and goes into SOS.' When AT&T urged users to update, replies were pessimistic — 'The bugfix update did nothing,' wrote one commenter, while another said they had to get the phone replaced 'for SECOND time.' Apple has not disclosed the exact number of affected devices, and per SSBCrack News, early reports suggest stores are swapping affected units at no charge when appointments are booked, though no formal service program exists yet.

The affected model is a hardware outlier in Apple's lineup: the US iPhone 18 Pro Max uses Qualcomm's Snapdragon X80 modem, while the smaller iPhone 18 Pro and international Pro Max units carry Apple's own C2 modem, as Gotechtor details. Both gHacks and MobiDevices stress that no evidence currently links the Qualcomm modem to the failure — Apple has not identified the modem as the cause, and the fault could involve the interaction between the phone, its software, and AT&T's network. So far there are no reports of similar issues outside the United States, no other iPhone models involved, and no other US carriers known to be affected, leaving the root cause unexplained.

For phones still working, Apple urges installing iOS 27.0.1 via Settings > General > Software Update, plus the AT&T carrier settings update — both together are meant to prevent the failure. The carrier settings package arrives automatically over about 14 days, and impatient owners can trigger it manually via Settings > General > About. If an iPhone has already lost service, Apple says to contact Apple Support or AT&T, or visit an Apple Store or AT&T retail location for a replacement. Per gHacks, until a replacement arrives, Wi-Fi is the only way to use internet services on an affected phone, since standard cellular functions cannot be relied on.