Voice activated cell phone: Lazy thumb (Link: Yanko Design blog, and many more)
This concept cell phone is distinguishable from current mobile phones, because it is primarily voice-activated, has only three buttons, and minimal function. OLED embedded sliding buttons display messages & information. The user operates the mobile phone by sliding up/down the buttons (a concept inspired by children's tile puzzle), and send/receive calls and text messages. To send text message, Speech to Text Transcription system is used.