As Hebeisen says, the best way to keep yourself safe is simply to not use a phone that's no longer supported. If you're short ...
The market for refurbished phones is taking ... sometimes all you need is for a phone to be a phone. Amanda Hoover is a senior correspondent at Business Insider covering the tech industry.
Why can I get so much for this 3-year-old phone? Right now on eBay a used iPhone 7 goes for around $150 to sometimes over $200. But a Galaxy S7, which also came out in 2016, sells for under $100.