iPhone 18 Pro issues: AT&T connectivity failures and speaker popping

Two weeks after launch, iPhone 18 Pro and Pro Max owners report cellular connectivity failures on AT&T and crackling or popping noises from the speakers. AT&T urges users to update to iOS 27.0.1, while some report getting replacement units.

• iPhone 18 Pro Max gets stuck in SOS mode and fails to connect to AT&T
• AT&T advises updating to iOS 27.0.1 to restore calls and data
• Users report crackling and popping sounds from iPhone 18 Pro speakers
• Pro Max uses a Qualcomm modem; Pro and Duo use Apple's in-house C2