I - IF YOU WANT TO TRACK AN ANDROID PHONE/TABLET, THESE ARE REQUIRED CONDITIONS:
1. You must keep in your hand the target device
A physical access of 5 minutes is required for the installation. As soon as the installation is completed, all the data monitored will be available through your personal online account immediately.
2. (Optional) Check if the spy app is trusted with Android phone or not
In order to make the app work well on an android device (target), you should check the app is trusted with Android OS or not.
We have some technique articles about 'how to make trusted with android phone' in our main site mobileleak.com or visit this post https://mobileleak.com/essential-settings-protect-app/
Please remember that there are some different (about GUI and options) between versions of Android. Kind of phones (Samsung, HTC, Google,...) are the same.
3. Check all configurations to prevent the app will be stopped after installing
Please read this article How to prevent from uninstalling/removing the app from target device?
For more details about how to install the spy app, you can visit directly on their main website.
II - IF YOU WANT TO TRACK AN iPHONE/iPAD, THESE ARE REQUIRED CONDITIONS:
(we are collecting information from our sponsor and will update on Dec 2018)