Telephones in 2020 will be archaic, relics of a bygone era-like transistor radios are today. Telephony, which will be entirely IP-based by then, will be a standard communications chip on many devices. We'll probably carry some kind of screen-based reading device that will perform this function, though I assume when we want to communicate verbally, we'll do so through a tiny, earplug-based device.
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