Samsungs preinstalled app Smart Manager helps you manage your battery time, which is a great feature but if it's enabled for Truecaller, it could mean that you could disable caller identification and spam blocking by mistake. Follow the steps below to enable the caller id and spam blocking features.
Steps for Android 9 and above:
- Open your phone settings
- Device care
- App power management
- Apps that won't be put to sleep
- Add Truecaller to this list
Steps for Android version 6 to 8:
- Open your phone settings
- Tap on Battery
- Tap on Details or Info > Find Truecaller > Turn off optimization.