you will need: a phone with a removable back and battery a pen paper scissors
Step 2: Remove the back
you will need to remove the back and the battery. your secret message will go under the battery
Step 3: Cut the paper
cut a square of paper just small enough to fit in behind the battery. cardboard is too thick, but you could hide money! bwahahaha!!!
Step 4: Write the secret!
write down your secret. this could be passwords, codes, secret notes, but forget this step if you are hiding money! bwahahahahaha!!!
Step 5: Put in the paper...
put in the secret message or the money. make sure the paper does not touch the battery contacts, or the phone will not work. also, remember that you hid this in your phone. forgetting could be annoying.
Step 6: Replace the back
put in the battery, then put on the back.
Step 7: You've finished!
congratulations! you now have a secret-message-holding phone, and the best bit is, no-one will suspect there is anything in there! this is my first instructable, please post comments and tell me how i did, thanks. author's note: you could also put in a micro sd card with password protection, instead of paper.