Android:
Installs Tabernus App, uses an OS call to unmount and erase external storage and then subsequently performs an overwrite of the freespace using a HMG algorithm followed by a factory reset to secure the device.
iOS:
Cryptographic Erasure using the proprietary Apple iOS commands, followed by a complete overwrite of the devices firmware which happens is combined with a complete factory restore, deploying the latest firmware from Apple.
Blackberry:
Cryptographic Erasure using the proprietary Blackberry commands, followed by a complete factory restore and reset.