Of all the spy programs that I have tested, mSpy is the only one who still installed on my phone. Certainly is the program that provides the relationship more balanced between the functions offered and the cost charged. The monitoring options are diversified and stable, in addition to the program to receive the commands sent remotely through the control panel of your account. MSpy is compatible with all versions (including the latest) of the major operating systems (iOS, Android, BlackBerry, and Symbian). It may happen some functions are not available due to the model of your device: the location tracking, for example, will be impaired in a smartphone without GPS. The more complete and up to date for your device, the greater the ability of monitoring provided by the program.