AT&T Acknowledges iPhone 18 Pro Max Issues, Urges iOS 27.0.1 Update

AT&T texted customers urging iPhone 18 Pro Max owners to immediately update to iOS 27.0.1, saying some devices cannot complete calls, texts or data, including 911. Thousands of users across Apple Support Community, Reddit and MacRumors Forums report the issue, and many say the update does not fix it. The cause is unconfirmed and Apple has not commented publicly.

• AT&T urges iPhone 18 Pro Max users to update to iOS 27.0.1 over cellular issues
• Thousands affected: calls, texts and data fail, including 911 calls
• iOS 27.0.1 release notes do not mention a fix for AT&T issues
• Only the U.S. iPhone 18 Pro Max uses a Qualcomm cellular modem