It seems like its not quite a scam and is actually true that there is software that can do this.
However, the image that you have attached looks like its posted by an affiliate and not direct from the actual software manufacturer as it appears to make a few claims that the real program cant. ie the official mSpy site claims that it wont work on:-
~ Windows 7 devices
~ iPhone 5
~ iOS 6
~ Other i-devices must be Jailbroken
It also doesnt make it clear that you need to actually have access to the phone to install the software on it in the first place... and that the phone needs to be connected to the internet
mSpy seems to have a large target audience for parents and employers and it would appear that quite a lot of people have already tried this app. - (based on download sites and social media sites such as FB or YouTube were it has a hell of a lot of likes!) You can even buy the app from amazon.
I find it quite scary that not only does it record all texts/phonecalls/tracking locations, but can also actually be used as a bug to monitor (non-call) conversations within 15 ft of the phone. Yes I can see a place for it for parental control.. and even in the workplace.. but Im not sure about the fact nor legality that it can be used to monitor anyone at anytime of the day without their consent as a remote listening device.
This is a vid from the real site showing just how powerful the app is
[youtube]2ql8PBGKh_U[/youtube]
lol that one guy is rather (un)fortunate though, in just a few months he discovered:-
~ A trusted employee stealing thousands of dollars per month.
~ His son was taking drugs
~ His associates' wife was having an affair.
~ He suspected his own wife was having an affair - she was innocent, but mSpy saved her life after a terrible car accident.