What are three smartphone apps that you can't live without?

The three smartphone apps I can’t live without are Samsung Notes, Voice Recorder, and Kakao Talk.
I use Samsung Notes to organize my ideas and keep track of important tasks.
The Voice Recorder is essential for recording lectures or sudden thoughts that I don’t want to forget.
And Kakao Talk is my main way of staying connected with friends and family. 
That's why I use them all the time. They are the most convenient for me.

* Laura, you did an excellent job on your homework. Keep up an amazing job! ^^