the simplest way of spying on someone smartphone is by using keylogger,it will records every thing and send to you.
Keylogger types: It has two types
Software keylogger
Hardware keylogger
Hardware: This is an external device. Which we connect to our computer to record data.
NOTE:For Android phone, hardware keylogger is not possible.
Software: It is a software made by hackers to record keystrokes. You can call it malware. Software Keyloggers are also available for the computer. For Android phone, you can download from play store. Good enough most of them are free
Best thing to note :All antivirus are useless on Android. None of the antiviruses detect this keylogger as virus
It is the best free spy app to record all keyboard activities. You can apply a password for securing log files so nobody can see it.
Here are simple steps to enable this app.
1: Install App from play store here is link
2: Open it and click on activate shadow button it will show you a popup. Now tap on “Proceed.”
3: It will take you to Language & input settings there is one more keyboard “Simple IME” you need to enable this by clicking on it. choosing-shadow -keyboard
4: The last step Open any app where you can type something like I am using Opera browser. When I click on the search box, it shows the keyboard. When it show you keyboard then Scroll your notification bar and click on “Chose input method” it will show you are enabled keyboard here you can choose “Simple IME” to record all data. enable-shadow-keyboard Now it will record all data.