http://www.dailymail.co.uk/news/article-3093953/Personal-details-500million-Android-users-risk-Researchers-impossible-completely-clear-data-handset-changing-phone.html
Personal details of 500million Android users at risk: Researchers find it is impossible to completely clear data from handset when changing phone
- Emails, texts, pictures, videos and apps can all be accessed after full wipe
- Up to 630million phones don't wipe internal SD cards when phone is reset
- Researchers say the issue may limit growth in the phone and app market