I don ' t necessarily agree with the whole buy cash 100 % thing with every situation someone rebuilding credit with a good steady income for example but I do agree a person should be financially ready for an expensive car and hobby . People at my work engineering buy expensive cars that are 5075 % of their salary and it ' s just insane to me . The worst I see is when people lease a car and then mod it beyond minor boltons . In three years you either have to undo all the mods so now you have a garage full of parts with no car , or buy the car not necessarily bad but if your car is now worth less than what the remaining payoff is , your immediately upside down in the car . <| sep |> Xprivacy works by feeding fake data to the app requesting information when you ' ve blocked a permission , not by denying the permission . This allows you to use apps that would crash or refuse to work if you simply denied a permission . If you want to deny or disable a permission entirely , you ' ll need another app but be careful because this can make apps and your device unstable depending on what you deny . I know of a hand full of apps that have this functionality , though most of them are infrequently or never updated . 3 C Toolbox uses the Xposed framework gets updated fairly frequently , but I ' d definitely spring for the pro version because giving an adsupported app root seems unwise . Rom Toolbox Pro paid , largely broken after KitKat , Disable Service free , Chinese ? last updated in 2014 , LBE Privacy Guard free , Chinese translated versions sometimes available , Permissions Denied paid , not updated since 2013 also have this functionality but don ' t use Xposed as far as I know .