I have a calculator that is correct 80% of the time. But don't worry, every time I use it, I check the results myself.
@MartinEscardo Funny enough, for some calculations a real calculator and the iOS calculator disagree. The physical calculator does all operations left to right, where the iPhone calculator does all operations by order of operations resulting in different sums in the end.
How many people knew that, and how many have trusted the calculator all these years?