If you are looking info about apps spy read this stuff https://techpresident.com/keeping-yo...from-spy-apps/ If you find that your smartphone isn’t performing well, then it could be a sign of spyware infection. However, there are other numerous reasons for phone becoming slow. It could be due to some faulty app that is consuming all your resources. So, if your phone is slow, you can’t be sure that someone is spying on you, it still is a sign.