https://www.cnbc.com/2019/03/28/billionaire-warren-buffett-a-major-apple-investor-uses-a-20-flip-phone.html

Warren Buffett doesn't use an iPhone, despite the fact that the firm he founded and runs, Berkshire Hathaway, owns 5.5% of Apple.

Instead, he uses a $20 flip phone: the Samsung SCH-U320, which is currently selling for between $20 and $30 on Ebay.