almost 40% of all mobile phones work on Android. A linux based opensource software which is customized my plenty of vendors and notably Samsung. Android is one of the most credited software for mobile phones standing next in quality to Iphone software. Every 2nd or 3rd phone today runs on android and this makes it so popular.
Finding a spy software for Android is infact very easy. A search for android Spy software on my mobile phone resulted in over 20 softwares which i could use. The key difference in these softwares were significant. Not every software had all the features you could get and when you come across some softare which actually really works and feels excellent, you seem to find the price a bit exorbitant. A bit of research (for 3 -4 days) and some real run down testing on each of these softwares, rounded us with mobistealth. Affordable, decent set of features and some good usability too. It was worth the money i would say.