"Unlock Hidden Features of Your Smartphone Calculator with These Tips"
The iPhone calculator has a secret scientific mode that can be accessed by turning the phone sideways, unlocking screen orientation, and hitting the '2nd' button. The scientific calculator includes exponential, logarithmic, and trigonometric functions, as well as a 'Rand' button for generating random numbers. Users can switch between the standard and scientific calculators without losing their calculation by rotating their phone. Additionally, users can delete individual numbers by swiping left or right and copy their last result by holding down the app icon from the home screen.