If there is anything that counts as a “must-have” application for your Android phone, Tasker is it.
Tasker is the first Android app I ever paid to purchase, and is by far the most versatile I’ve seen. I am convinced that with it, you can grant your Android the smart-phone equivalent of super-powers.
The best way I can think to describe the phenomenon that is Tasker is that it allows you automate almost anything you can do with your phone. You do this by creating macros. You can execute these macros manually, just like starting another application, or (and here’s where the true power of Tasker comes in) set the macros to be triggered automatically based on context.