The iPhone is such a versatile mobile/smart phone. You can do so many things and download plenty of applications which suit your lifestyle and preference.
I have recently discovered so many functional applications I can use in line with my work and other personal requirements. Those applications are under productivity category. There are more in the Apple App store than just the productivity category.
You can browse through the various categories in your iPhone's app store and search for free apps if you prefer to not pay. Not only that, some apps have trial offer so you can try them first before you decide to purchase them.
I am fond of the games and other lifestyle apps you can find in the iPhone app store. Although my iPhone is a second hand from my hubby, I try to weigh things first before I download an app. Not all these applications will be used regularly so I only download and use the ones I think will make my life more fun.
So, if you have an iPhone, iPad or even an iPod, check the myriad of choices in your app store and see what you can download for your personal and professional use.