Google has done some serious work of late to be more transparent about its ongoing effort to secure Android.
One practical, visible measure that you can check yourself is the Android security level on any device running Android 6.0 or later. Every month, Google releases a patch that fixes the latest security vulnerabilities. Nexus devices get this immediately, and then it’s up to the other manufacturers to get with the program, approving and releasing the patch for their devices.
To find out the situation on your own smartphone or tablet, go to Settings > System > About device (this may differ slightly based on your particular phone maker and interface).
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