When Warren Buffett got a cell phone, the first call he made was to his stockbroker at Citigroup.

That broker, John Freund, still remembers the conversation. According to him, it was around the mid '90s the famously low-tech Buffett called to say he wanted to try out his new phone. "I thought he was calling to say, 'where is the market going to open?' or to rearrange an order," Freund said. "And then you hear, 'I'll take an Egg McMuffin and a Coke to go.' He was in a McDonald's in the drive-through lane."