San Francisco (CNN Business)Robert Ross was sitting in his San Francisco home office in October 2018 when he noticed the bars on his phone had disappeared and he had no cell coverage. A few hours later, he had lost $1 million.
Ross was the victim of a SIM hack, an attack that occurs when hackers take over a victim's phone number by transferring it to a SIM card they control. By taking over his cellphone number, a hacker was able to gain access to his email address and ultimately his life-savings, Ross said in an interview with CNN Business.