Without speaking a word, a hacker could use that radio attack to tell Siri or Google Now to make calls and send texts, dial the hacker’s number to turn the phone into an eavesdropping device, send the phone’s browser to a malware site, or send spam and phishing messages via email, Facebook, or Twitter.
..the researchers contend that a hacker could hide the radio device inside a backpack in a crowded area and use it to transmit voice commands to all the surrounding phones, many of which might be vulnerable and hidden in victims’ pockets or purses. “You could imagine a bar or an airport where there are lots of people,” says Strubel. “Sending out some electromagnetic waves could cause a lot of smartphones to call a paid number and generate cash.”
