Intruder Alert. Intruder Alert. Some people want similar security for their Android devices so they become less attractive to thieves. A new app called the CaughtU Pro will probably discourage snatching and theft because it takes photos of anyone who’s been trying to access your phone. It’s another security app that helps the owner to find his lost smartphone. If not, at least, have an idea who has his phone or who was last person who accessed it.