Unfortunately due to technical barriers you cannot install XNSPY application remotely. You will require physical access to the target phone only once. After that you will be able to remotely access and operate the XNSPY software application.
XNSPY runs with all the latest Android phones having OS 2.3 and above as well as all the iPhone models with iOS 6 and above. For complete compatibility details kindly visit : http://xnspy.com/compatibility.html .