EXTEND the wire from the camera to the phone (or the foil track) and use it for a door monitor or security camera as Jamesrpatrick says you cannot use them as stand alone devices as they need the circuit inside the phone to work them
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It's pretty much impossible to remove the camera from the phone, but as long as the battery is charged, all functions except calling/texting should work. If it has a microSD card, you can buy an adapter for like $2.00 online and transfer the pictures to your computer. But phones don't have very good cameras. Also, if you remove the IR filter in the lens assembly and make an IR illuminator, you have night vision.