I downloaded iBlacklist application from App Store for my iPhone 4S not jailbreaken phone. RoofMonkey suggested me to jailbreak the phone first and then install the application. I acted against his advice and the result is I ended-up paying money for the application but it's not working bcz my phone is not jailbroken. I am sorry RoofMonkey I didn't listen to u. My complain is if the application is meant for jailbroken phones then why Apple allows these applications to be sold in their store! Why don't they advise beforehand that this application is not meant for Not-Jailbroken phones.