Step 1: Materials needed.
1x Mobile phone (With recoverable backing and battery)
1x Sheet of paper
PS. Sorry for the flash on this photo, i had it turned on and i can't be bother re-taking it.
Step 2: Making your paper to hide.
Next, you need to write your information onto the paper. So i have just made up a MSN password by writing:
So after this is done, your ready to progress to the next step!
Step 3: Hiding the paper.
First, remove the backing and battery from the phone, and fold your piece of paper a few times so it fits into the given area.
All thats left to do now is re-assemble the battery and backing and viola!