A PAD, or Personal Access Device, is a (usually) small computing device that allows a user to access the Net and perform various other tasks. There are countless models available, of different shapes and sizes, and each with unique features such as:
- Net connectivity
- voice call capability
- built-in secretaries
- remote connectivity to/control of hardware
- internal memory for data storage
Meanwhile, a VoicePAD is a personal access device with most of its functions ripped out. Just about all it's good for is making voice-calls and managing your contacts. The only reason to even have one is for its anonymity, which for a certain kind of person is all the reason one needs.