With many of these tools either free or available for a minimal cost, it can be easy to go on an app shopping spree, loading your device with all sorts of time-wasting trinkets. But, selecting some key apps that mesh with your business needs and personal preferences can be truly useful.

Some useful business apps:

• Tripper – A mileage log perfect for the sales person who spends a lot of time on the road and needs to file an expense report at the end of the month.  
• QuickBooks – Get a mini version of your accounting software program so you can track expenses and run a profit and loss report all while sitting in the doctor’s office waiting room.
• Box.net – A file-sharing and collaboration tool.
• For managing tasks and to-do lists, check out Remember the Milk (also available free to use online) or Things.
• Recordoid – Turn your Android into a dictaphone so you can record voice, add notes and even send as an e-mail.

What app has transformed your phone? Which apps would you recommend to other business professionals?

Sources: Nine Awesome iPhone Apps for Business; iPhone Business Apps and 101 Best Android Apps.