I am part of a start up that is creating apps that use "geofencing" to authenticate a user. The app is only supposed to work if the user is within a specific geofence. The problem we're foreseeing is that jailbroken phones will be able to trick the app / phone into thinking it's somewhere that it's not, ultimately fooling the authentication. We're curious if you have any insights into how we can combat this potential problem. Thanks.