This shouldn't be that hard to make.( I don't think ) But how about an app sort of like a stolen phone tracking system? It would be hidden inside the phone so you couldn't see it but if anyone ever steals your phone, you can call the phone tracking systems company and find out where it is/who stole it? I think this would be useful because everyone wants this phone and after 90 days of this phone, you can unlock it so I'm pretty sure everyone wants to keep their phone safe