ZTE devices

Kaspersky Who Calls may have the following issues (and solutions) on ZTE devices:

The app may not start automatically after the device is restarted or the app is unloaded from device memory. In this case, you should start the app manually.
The app may be unloaded from device memory by the operating system. To fix this, lock the app in memory.
How to lock the app in memory
Some steps may be different, depending on the device model and version of the operating system.
1. Open Task Manager. For example, hold the middle button until a list of all running apps appears.
2. Find the Kaspersky app.
3. Tap the icon next to the app name.
  The icon indicates that the app is locked in memory.
The app might stop working in background mode even if it is locked in memory. To fix this, change the application control settings in the battery settings.
For example, on ZTE Blade V7 with Android 6.0, go to Settings > Battery > Battery optimization > All apps > Who Calls > Don't optimize.

Some steps may be different depending on the device model and version of the operating system.
Notifications from Kaspersky Who Calls might not be displayed or might be displayed incorrectly. To fix this, on ZTE blade v7 with Android 6.0, go to Settings > Apps > Who Calls > Notifications > Treat as priority.