We can’t say confidently that is safe to use undetectable spy apps to track the other mobile phones. But you can have some precautions before installing them. You may need to find the best spy software which can be trustworthy and used by most people. You can visit this website https://www.netspy.net to find the best one to get installed on your target phone to track them in a safe way. There will be a simple process to track if you once installed on the phone by accessing physical at least one time.