Samsung Show W7900 Phone Projector
While this is not the very first mobile phone to sport a projector built-in but the Samsung Show W7900 might make this the next hot feature on mobile phones.
3.2-inch OLED display screen (240×400 pixels)
3G HSDPA up to 7.2Mbps, global roaming (900/1800/1900 MHz)
secondary front-facing camera for video calls
The projector has a maximum light power of 10 lumens (480×320 pixels) and can project to a wall up to 50 inches in diagonal. No additional details, launch date or pricing but you can see more photos of it here.