I just chatted with Spyfone. They offer an exteme pack like flexispy and when I asked how they are dealing with the Google play issue they replied that the app works as System Services and it can't be detected. It also has an uninstall protection so that it would require a code or account before another app or user uninstalls it. So even if Google play detects it, it cannot uninstall it. I will not be notified by Spyfone that it was detected but the app will keep working. They have a two day free trial. I might try it in my own phone that I have good play to see how it goes. I'm afraid two days aren't enough....