Security concerns have risen after reports came out saying Prime Minister Boris Johnson’s phone number has been publicly available online for 15 years. British news outlets reported that Johnson’s number was on a think tank release in 2006 when he was shadow higher education minister and was never deleted. Lord Peter Ricketts, the former national security adviser in David Cameron’s government, said that there’s a risk of the phone being tapped by a hostile state. “I know that modern systems like WhatsApp are end-to-end encrypted—nonetheless, I think one would be worried if a hostile state who had sophisticated capabilities, had the mobile phone number itself,” Ricketts told the BBC Radio 4’s Today programme on Friday. “That must increase the risk that they’re able to eavesdrop on some at least of the communications that are going on, and possibly other non-state actors as well, like sophisticated criminal gangs,” he said. “There is …