(adsbygoogle = window.adsbygoogle || []).push({}); I felt anxious about my little sister for she closely contacted with some bad guys recently , and we live in a single family without careful protection from mom, so I want to install a You must login or register to view this content.on my little sister’s phone so that I can know her activities. I just do it to protect. I hesitate now, if I install a keylogger on her PC, I will violate her privacy, but if I don’t, I will worry about her. Can someone give me some suggestions? Is there some safe and undetectable mobile spy? A free one will be appreciated.Thanks