How to download and use TheTruthSpy on my phone?

You can follow instructions step by step in documents in this link: http://thetruthspy.com/download-center to download and install TheTruthSpy into the target device.

 http://thetruthspy.com/how-to-install-mobile-spy-on-android-with-thetruthspy/

Choose a suitable version for the operating system of your target device. You can download the user guide document to learn how to use TheTruthSpy on these links also.