Abstract: Techniques for operating a voice-activated computing device are provided. These techniques can be used to prevent voice-based attacks on such devices. An example method according to these techniques includes receiving audio content comprising a voice command, monitoring electromagnetic (EM) emissions using an EM detector of the voice-activated computing device, determining whether the audio content comprising the voice command was generated electronically or was issued by a human user based on the EM emissions detected while receiving the audio content comprising the voice command, and preventing the voice command from being executed by the voice-activated computing device responsive to determining that the voice command was generated electronically.

Abstract: Apparatus and methods are described herein for managing communications. A cellular access point detects that a user equipment (UE) has entered its coverage area. The UE is registered with a server, which instructs the UE to activate a non-cellular modem. Communication with the server is handed over from the cellular modem to the non-cellular modem.