CCD imagers on digital cameras can actually see infrared light which the human eye cannot. This would include your camera built into your phone.
I haven't tried this personally but you can buy infrared LED flash lights online which when used in combination with a digital camera, camcorder, or camera on a phone should enable you to "see in the dark".
If you want to test this for free, take any old IR TV remote control (more expensive RF remotes won't do this) and aim it at your phone in camera mode and start pressing buttons. You should see a light going on and off (the IR transmitter).
Now multiply that light by getting a good IR Flashlight and you should be able to see whatever the IR Flashlight is pointed at.