*A cell phone (obviously with a camera on it)
*A case that fits snugly on said cell phone
*A floppy disk
*A pair of scissors
IR photography requires an immense amount of sunlight (or IR lights) to properly expose shots. That being said, do not look into the sun, with or without the filter on your phone.
*This isn't technically a true IR filter. However, for the price it does the job well enough.
Step 1: Camera Check
So how do you know if your camera has a blocking filter? Turn the camera on, get a remote control of some kind (TV/DVR/etc etc...), point the end of the remote with the IR LEDs in it (the end you point towards whatever you are trying to control/the end that has little LED bulbs on it) towards the camera lens, and press buttons. You should see them light up (probably purple). If you don't see anything, make sure the remote isn't dead and that you are pressing a button. If you still don't see anything, then you have a good camera and unfortunately the only way to continue is to take it apart. If you do see them light up, congrats! You have a camera capable of taking IR pictures.
Step 2: Break Your Floppy
Step 3: Assemble Your Filter
Step 4: Photographing in IR
Some of the best things to shoot in IR are plants. They reflect IR very well. The color of the film will come through in your IR pictures, so shooting in black and white makes for great pictures in IR.
Above are some examples of things photographed with this IR filter on my HTC Rezound. The first is a 60w equivalent daylight CFL, and the second is outside on a cloudless day at about 2pm. You can see how much light you lose putting the filter on, so remember to shoot with as much light as you can. I didn't bother doing any post-processing with these pics, but a little touch up can definitely help.