And NSA whistleblower Edward Snowden has helped design a mobile phone case he says will alert a user when their phone is potentially being surveilled. Speaking via video link to an event at the Massachusetts Institute of Technology, Snowden and his co-designer, Andrew “Bunnie” Huang, showed how the external device could automatically shut a phone down if electronic eavesdropping is detected. Snowden also said that while most people assume it is impossible for phones to be listened to while in “airplane mode,” governments possess the technology to eavesdrop even when people think they are safe.