AppManager

Adding to the list of things that you can do with root on Android: - App Manager[1] has a powerful feature that lets you disable trackers in every single app on the device. (Menu > 1-Click Ops > Block/unblock trackers) - Neo Backup[2] is the most comprehensive backup app on Android, with automatic scheduling. It lets you back up and restore anything you want, including app data that the developer labeled "no_backup". - Install and upgrade apps from third-party app stores without needing to manually confirm each installation. Extremely useful for Aurora Store[3] and Neo Store.[4] - Universal SafetyNet Fix,[5] combined with MagiskHide Props Config[6] and Magisk,[7] allows you to spoof SafetyNet on your device to improve compatibility with apps that check for it, including some banking apps, commerce apps, and games. > trusting Magisk, going

It depends on how the developer chooses to implement the notifications and on how the app is distributed. The Play Store distribution of Signal uses Firebase Cloud Messaging (via Google Play Services or microG) and falls back to WebSockets if FCM is unavailable. The website distribution[1] of Signal only uses WebSockets. I don't think Signal tries to detect whether the phone is Chinese, only whether FCM is available. Since Google services (including FCM) are blocked in China, apps that serve both Chinese and non-Chinese users usually find some way to support both FCM and the Chinese equivalents. For example, Airbnb serves users both inside and outside of China, so they distribute two builds of their app. The Play Store distribution of Airbnb relies solely on FCM for push notifications. The Chinese distribution of Airbnb,[2] according to a