家里有废旧手机的要留意，手机店员工透露关键内幕，提醒身边的人

Core Insights - The article emphasizes the hidden dangers associated with old mobile phones, particularly regarding personal data security and environmental impact. It highlights the importance of proper disposal methods to mitigate these risks. Group 1: Industry Insights - The mobile repair industry may not always provide accurate assessments of old devices, as seen when a repair shop owner falsely claimed a phone was worthless despite it being operational [4] - There is a significant market for recovering data from old phones, with some data being recoverable even after multiple factory resets, which poses a risk to personal information [5] - The environmental impact of discarded mobile phones is alarming, with over 500 million phones being discarded annually in China, and less than 10% being recycled through proper channels [6] Group 2: Data Security Measures - Proper data disposal should involve three steps: encrypting data, deleting it, and physically destroying the device [11] - The use of professional services that provide data destruction certificates is recommended to ensure data security [10] Group 3: Recycling and Repurposing - Companies should consider official recycling programs offered by mobile brands or participate in trade-in events organized by major e-commerce platforms [12] - There are creative ways to repurpose old phones, such as turning them into security cameras or dedicated learning devices for children [13][14]