Hack It Like It's Yours

WiPhone is built for hacking, not for some big corporation's bottom line. Complete disassembly in less than a minute, using only 6 screws. The operating system firmware is easily modified, and simple enough to be understood entirely by one motivated person.

Not only is WiPhone capable of completely free calling, it's also an open source, self-contained Arduino development platform. Unlike most other dev boards it comes in a nice package, with a battery, power supply, and on/off circuitry. Once your project is done, instead of an eyesore of tangled wires and stacked boards, it's compact and visually appealing.