WhyFi - The simple battery saver
Save Battery power and Data Usage by making sure your phone's WIFI is off when it should be, and on when it needs to be.
WhyFi is a simple WIFI and Bluetooth manager that aims to quietly manage your phone's resources in the background and save you precious battery power and expensive data usage on your monthly bill.
Completely Free, and you can Get it Here
When you are not near a WIFI network, your phone's radios are continuously scanning for a WIFI signal where there may be none. Similarly, if you are within range of a WIFI network, it is much more battery efficient to use WIFI than your phone's 3g/4g radios, as well as saving data. WhyFi provides a range of features to help solve this problem.