McAfee told the BBC he knew the phone was compromised when he read "SIM No MM # 2" warning messages on his cell phone. According to the BBC, hackers use McAfee's accounts to market little-known cryptocurrencies and recommend these cryptocurrencies in a fast, continuous fashion.
Relevant tweets posted by hackers have been deleted. John McAfee later said he would reduce his advice frequency to once a week.
John McAfee announced in April that he intends to build "the world's first true personal smartphone", saying it would be "the most anti-crack smartphone ever". Other security experts seized the opportunity to laugh at him, including Marcus Hutchins, 23, better known as MalwareTech.
Some people suspect that McAfee's account has been hacked and some users underline that he is not the most trusted person on the Internet. For example, McAfee had tweeted that he did not have an Instagram account, though he once announced through his Twitter account that he opened an account in January 2016.
Neither Twitter nor McAfee responded to the comment request.