Discussion in 'Android Devices' started by solo88, Apr 21, 2016.
Imho encrypting the phone once, which fills the storage with a pseudorandom blob of data, and then factory resetting is sufficient. In fact I would remove the SIM card and then factory reset just to make sure that any information from the sim didn't leak to the phone would also be fine.
Flash storage is not like a spinning hard drive, where previous data could leak without several attempts to flip all of the data bits randomly on the drive. There may still be some data, but it would a trivially small amount.
Since you've enabled encryption the 'filling' of the internal memory wasn't really necessary, once encrypted the data on the storage media itself isn't recoverable by conventional recovery utilities, all files are just scrambled bits.