This behavior is likely a combination of VoIP app behavior and OS-level changes in One UI 7. Let's evaluate the possible causes in your list: --- ✅ Most Likely Cause > 3. Power button behavior override during VoIP calls (Facebook might be preventing locking to avoid interrupting the call) Facebook Messenger often keeps the screen active during calls (to allow quick access to controls). One UI 7 might have changed how apps interact with power management or foreground services. The app could be holding a wake lock or using a foreground service to keep the screen on intentionally during VoIP. --- 🛠️ Secondary Likely Causes > 1. App conflict with new One UI 7 permissions/APIs One UI 7 (likely based on Android 14/15) may have introduced new privacy restrictions or API changes affecting how apps can control device power state. > 2. Temporary bug due to update — not fully optimized app compatibility Facebook Messenger may not yet be fully optimized for One UI 7, especially if this behavior wasn't present before the update. --- ⚠️ Less Likely (but Possible) > 4. Device/OS bug in power key handling during VoIP calls It could be a Samsung-specific bug, especially if similar behavior isn't seen on other Android 14/15 devices using Messenger.
