A free app for Android, by Pinellas CodeWorks.

Secure Wipe is an application that allows you to securely erase data from your mobile device without the need to root your device.

When you install the app, you will be presented with a screen that will ask you to choose a phone model. You can choose to wipe the entire phone or select specific areas. Select the areas and press the Start button. The application will then begin wiping the selected areas. It will do this until there is no free space left.

After you have selected the areas you want to wipe, you will be presented with another screen that will give you the status of the operation. The application will then begin the process of erasing the data.