Sometimes the instruments were operated in pairs at each end, making conversation more convenient but also more expensive.
But the idea of a two-way communications device that transmits pictures as well as sound is as old as the phone itself.
Cell phones became popular during the cellular revolution that started in the 90s.
According to some sources, it was Trump's son-in-law and senior adviser, Jared Kushner, who overruled the White House staff and ordered the call put through.
Description: Companies such as Samsung, Motorola, and Huawei are gearing up to release the second generation of folding phones, but even the ones revealed so far, such as thehave shown to be pretty impressive.