Most thieves are people looking for a quick opportunity.
Most are also druggies looking for something to sell quickly to feed their next shot. They don't have time for anything complicated or difficult.
I'm going by official police figures here, but interviews with ex-cons and reformed serial thieves also support this.
Raising the bar slightly will cut out a lot of problems. Basic stuff like:
- keeping your phone out of sight and in a safe / zipped pocket when you're not actively using it,
- not using it in dodgy places or when getting on or off public transport,
- not using it or when you are busy doing something distracting like unlocking your front door or getting into a car or using an ATM
will go a long way. It's a lot less hassle to not have your phone stolen in the first place, than have it stolen and go through all the hassle of using this app, liasing with police etc.
That said, I might look into buying this app, but I won't pin all my hopes on it.