The first mobile phone call was made to the company's biggest rival.
Why it is true
In nineteen seventy-three, Martin Cooper of Motorola used the first mobile phone prototype to call Joel Engel, the head of research at Bell Labs, just to brag about his invention.
Source: Telecom History
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.