PDA – (personal digital assistant) - A non-phone mobile handheld device for managing email, calendar and contacts; some PDAs also include GPS functionality. The assistance and convenience of your computer in the palm of your hand. GPS – (global positioning system) – A non-phone personal navigation device used for navigating real-time while walking, driving or otherwise on the move. Get turn-by-turn directions viewing a map as you move along your way. Smartphone – A mobile handheld device that is first a phone. It also has an operating system allowing you not only to manage email, calendar and contacts, but enjoy familiar Microsoft applications keeping you connected to your data and the internet. It is often smaller in size than devices optimized for data entry. Converged voice/data – The convergence of the mobile phone and the PDA, this advanced mobile handheld typically has a larger screen optimized for data yet it offers voice-service like your cell phone.