One reason why many people buy a Personal Data Assistant is to be able to organize their plan of the day. You can easily fit your smartphone in a pocket, and use it in the subway or train. This is the reason why this small device is an excellent reminder of what else you have to do during the day. To make this even easier and more convenient, you can organize your smartphone desktop so that it will include categories like notes, tasks, calendars, business events etc. Start with very few basic categories and try to develop them as you go into more categories. If you wish, you can use a simple software that will help your organize your plan of the day like a calendar. Remember that by creating categories you increase your productivity and make your notes easier to find.
While not everyone might benefit from a smartphone, it is especially useful for those who tend to be late appointments. If you notice that very often you miss appointments or you are late for work, it means that you could benefit a lot from having a smartphone. These days smartphone are relatively inexpensive, and you can probably find a bargain on eBay.