Apple has confirmed that some iPhone 18 Pro Max units on AT&T's network in the United States can lose cellular service entirely — and that a software update cannot bring the affected phones back. Devices that have already dropped off the network must be replaced, Apple said, after thousands of complaints piled up on support forums from owners whose phones showed "SOS" in the status bar and could no longer make calls, send texts, or use data.
Apple's statement, issued October 2: "We have identified an issue affecting a small number of iPhone 18 Pro Max users on the AT&T network that may cause a device to lose service and be unable to make calls. We released iOS 27.0.1 earlier this week and strongly encourage all iPhone 18 Pro Max users to update now, and are also issuing a carrier settings update today."
Which iPhones are affected
The problem is narrow, on Apple's account of it:
- Model: iPhone 18 Pro Max only. The iPhone 18 Pro and other models are not affected.
- Carrier: AT&T only. Apple says it has not observed the issue on any other network.
- Symptom: The phone drops to "SOS" or loses service outright, blocking calls, texts, and mobile data — including, in some reports, emergency calling.
Apple has not disclosed the underlying cause. One detail stands out, though: US iPhone 18 Pro Max units use Qualcomm's Snapdragon X80 modem, while the iPhone 18 Pro — and international iPhone 18 Pro Max variants — run on Apple's own C2 modem, and those are unaffected.
The fix that prevents, but does not cure
Apple shipped two updates: iOS 27.0.1, released earlier in the week, and an AT&T carrier settings update issued October 2 that will download automatically over 14 days (owners can trigger it manually under Settings > General > About). Both are preventive — they stop healthy phones from developing the fault.
For phones that have already lost service, no update helps. Apple is directing those owners to contact Apple Support, book a Genius Bar appointment, or go through AT&T to get the device replaced outright.
Are Philippine iPhone 18 Pro Max units affected?
No — on two counts. First, the fault has only been observed on AT&T, a US carrier; no Philippine network is involved. Second, the hardware is different: as our iPhone 18 Pro Max teardown coverage detailed, Philippine-market units carry Apple's C2 modem, not the Qualcomm X80 found in US units at the center of the AT&T complaints.
That is reassuring timing, because the phone is just arriving here: pre-orders opened October 2 in the Philippines from ₱94,990. Local buyers should still install iOS 27.0.1 promptly — it is good practice, and this is already the second early-life bug Apple has patched on the iPhone 18 line after the Face ID reboot bug fixed ahead of Philippine pre-orders.
For a flagship that starts above ₱94,990 locally, two confirmed launch-window defects — one of them requiring outright hardware replacement in the US — is not the start Apple wanted. The saving grace for Filipino buyers is that both the carrier and the modem at fault sit an ocean away.
