BBC新闻：捷克一家安全公司从被“恢复出厂设置”的旧手机中提取出了数千张照片，包括许多躶体自拍照。大多数智能手机都有“恢复出厂设置”的功能，可以对手机初始化。但这家叫做Avast的公司发现，一些老款智能手机只删除了数据的索引而并非数据本身。这意味着手机中存储的照片，电子邮件和短信可以相对比较容易的恢复。

恢复出厂设置的隐患

BBC News: Thousands of pictures including "naked selfies" have been extracted from factory-wiped phones by a Czech Republic-based security firm.

The firm, called Avast, used publicly available forensic security tools to extract the images from second-hand phones bought on eBay.

Other data extracted included emails, text messages and Google searches. Experts have warned that the only way to completely delete data is to "destroy your phone".