There are many people who would have happily paid hundreds of dollars for a professional android spy app like Calculator vault, but for a fair price there are a few calculators that can be hidden on your phone. This isn't the usual "android spy app" you get from the Google Play Store, because there are more than a few versions of android which don't allow installing third party applications. Most of these android devices run on Kit Kat 4.4.2 which is an upgraded version of Android 4.4.2 and does not allow installing any app that is not signed by their developer. So what can you do if you can't get a calculator on your phone which is preinstalled and can't be moved to a new phone?
There is an option available called android hiding. This hides your android spy app in different ways. The first option is to hide it from android diagnostics. This will tell android security that a certain program is being used, but it won't actually show up in the list of installed apps. You could also hide it from android security by setting it as an instance, but this will only show up as a background application. Finally, you could hide your android calculator, but this will prevent you from seeing it on a variety of android phones.
In order for your calculator to run smoothly on your android phones you will need to be able to tap into it and use it. If you don't then you will miss out on a lot of the fun. Fortunately, android security has made it much easier for people like you to install a mobile version of android spy. After installation the android spy app will monitor activities in the background, track internet history, and log any activity that it finds. This makes it very easy to keep track of what is going on with your android phones.