personal communication implant(s)
what technological difficulties would one need to overcome to implant the components of a cellular telephone to allow people to communicate over existing technologies without needing to carry an external device? Bone conduction should allow one to hear, and finding someplace to keep a microphone that would be able to pick up one's voice seems like a minor challenge. The most obvious difficulty I see is a power source, although I wonder whether the microwave radiation I understand cell phones to use to communicate with the towers might be a problem for adjacent tissues. The other obvious question is of course how to interact with the device, to make or accept calls, for example.