Straight out of sci-fi (get used to hearing that over the next decade), comes the phone that you use without speaking. According to New Scientist:

‘A neckband that translates thought into speech by picking up nerve signals has been used to demonstrate a “voiceless” phone call for the first time.

With careful training a person can send nerve signals to their vocal cords without making a sound. These signals are picked up by the neckband and relayed wirelessly to a computer that converts them into words spoken by a computerised voice.’

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