[EdFNJ]

Originally Posted by dougawhite

If you're clever you can use an old cell phone as a security camera. Try This Clever DIY Trick to Repurpose Your Old Android or iPhone - CNET

Except if you wanted it to be a doorbell you'd have to superglue it to the front door molding outside and when someone arrives they would have to shout "DING DONG" very loud.