hack proof? besides from COD modifying, blackberry is fairly secure when compared to other platforms. however, where BB security may rule, its social and usability aspect and integration i think has taken the back burner when compared to other platforms. iOS 6 is well integrated when it comes to social interaction and apps. something i feel BB really will never make a comeback from.
I doubt anything is truly hack proof. Harder to hack perhaps. Any platform can be easily hacked if the users are not careful with what they grant app permissions to. If you like to install tons of apps and just grant permissions to everything for every app, every platform you use will be vulnerable to hacking. Just my 0.2 cents.
