We take our smartphones everywhere we go, and with their powerful processors and LTE connectivity, they can be indispensable as personal assistants and productivity aids. If you're aiming to be more productive in the new year, adding some apps to your mobile device can be a step in the right direction. From note-taking apps and mobile office suites to calendars, timers and to-do lists, here are our favorite productivity apps that you can install now on your iOS or Android device.