Don't leave any trace in your phone with Secure Wipe

Secure Wipe finds all of the free space that Android will give us in three primary areas where data is normally stored and overwrites it as completely as the phone will allow:
1. System - This is the protected data area shared by all applications.
2. SD Card - On some phones this is the actual SD Card and on others it is emulated SD Card space.
3. Optional SD Card - On some phones this is the actual SD Card and many other phones do not have this space.