Are you planning to borrow money for a car, house, or personal expense? Grab a loan calculator; it helps you budget.

On the surface, the default iOS Calculator app seems very simple. But, there are a few tricks up the Calculator app's sleeve.

"Or use the scientific calculator for exponential, logarithmic, and trigonometric functions," according to Apple.

If you unlock your screen orientation and turn your phone sideways, it reveals a whole new calculator with many more functions! Other tips for using the calculator include how to deal with little ...