Factory reset may or may not wipe all your Android usr data. They suggest this:
Quote:
√"If you plan to resell or discard your device and you haven't already, encrypt it and then perform a factory reset," Android security lead engineer Adrian Ludwig said.
- Encrypt the data on your smartphone prior to putting it up for sale or disposing it. To do this, head to Settings > Security > Encrypt Phone.
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http://www.techtimes.com/articles/55...e-solution.htm