Apple - Pcglance

iPhone Ringtone Changed by Itself? Six Reasons

Two unrelated problems share one symptom. A tone reclassified as a text tone, or iCloud Contacts wiping your per-contact tones.

Reported on some iPhone 15 Pro and 16 Pro units from September 2025. One owner got the option back from a later iOS update.

Connect On Demand, an app-side auto-connect, or a profile left behind by a VPN you deleted months ago. Three different owners.

Reported since September 2025 and still unresolved. The Contact Key Verification prompt and the sign-out are the same event.

Switching Face ID or Touch ID off is not enough. The owner who got the button back had to delete the enrolled fingerprints.

Apple says the code has to be detected in Messages, and a service that texts you a code fits Apple own definition of an unknown sender.

Turning off Automatic in Display and Brightness leaves a second automatic schedule running behind your Home Screen icons.

Apple says Auto-Capitalization works in an app that supports it, which is why capitals appear in Messages and nowhere else.

Apple says a Focus delays delivery rather than silencing it, and iOS 26 added two more switches that sit between an alert and your screen.

Apple lists Auto-Lock as one of the things Low Power Mode takes over, and on newer iPhones the mode can switch itself on at 20 percent.