Note about Google-Android phones: how long you use each app and when is tracked. To avoid this, use a custom rom without GApps. You can also "turn off" this "f

Note about Google-Android phones: how long you use each app and when is tracked. To avoid this, use a custom rom without GApps. You can also "turn off" this "feature" from some menu online, but I'm pretty sure that doesn't actually stop data collection.