Bluetooth operates using radio waves while infra-red communication works on fast pulses of light. If you have to send data from one mobile to the other using infra-red technology, you will have to keep both the mobiles facing each other. In other words the sensors of both the devices must be in each other's immediate line of sight.
If something comes in the way of the two mobiles devices, the message or data will not pass through. Bluetooth technology however can pass through walls. You can send messages, data files, audio- files, video-files etc from your mobile to the other person in the next room, as long as the other mobile is within the radius of 10 meters. Infrared also only works between two devices at a time while Bluetooth can work with as many as mobile devices as you want.
If something comes in the way of the two mobiles devices, the message or data will not pass through. Bluetooth technology however can pass through walls. You can send messages, data files, audio- files, video-files etc from your mobile to the other person in the next room, as long as the other mobile is within the radius of 10 meters. Infrared also only works between two devices at a time while Bluetooth can work with as many as mobile devices as you want.