Which of the following is NOT considered a "device" when used in its normal function?

The term "device" in the context of telecommunications and surveillance typically refers to an electronic apparatus designed or used to serve a specific functional purpose. When considering the normal function of these devices, a smartphone, voice recorder, and microphone are all explicitly designed to capture or transmit sound or communication in a manner that is conducive to recording or monitoring conversations.

Telephone equipment, however, particularly in its traditional role, is primarily functioning to facilitate voice communication between two parties rather than actively recording or surveilling those communications. While it can be part of a surveillance system when equipped with specific capabilities or used in conjunction with other technology, the baseline or conventional function of telephone equipment does not typically align with surveillance activity. Thus, it stands out as not being classified as a "device" in the same context as the other options, which are more inherently associated with sound capturing and monitoring roles.