Linux and smart phones
So you want a cell phone that's also a PDA? Smart phones can make calls, synchronize your calendar with your PC, act as data storage devices, and connect your PC to the Internet. You can use your Linux PC to connect with and even program some mobile phones using some of the following tools.
In testing these open source applications I used a Nokia phone running Symbian OS v8.0 and the Series 60 Platform second edition user interface, with USB, Bluetooth, and Internet connectivity. My computer is a laptop with Kanotix, a Debian-based distribution.