How to install cracked iPhone4 apps?

Yeah of course it is possible.You have done the first step already i.e. iPhone 4 is jailbroken.But after that you have to install .IPA file manually without using itunes. .IPA file is an iPhone application which stores an iPhone app.This file is only compatible with apple products.Along with that you have to install AppSync in order to install and sync cracked apps with iTunes. AppSync, a free Cydia app that will let you install cracked apps on iPhone, iPad and iPod Touch. It is similar to Installous that basically patches the Mobileinstallation file on your iDevices so you can install the .IPA files manually. Follow below steps to install cracked iPhone apps:Launch Cydia on your jailbroken iPhone, iPad or iPod TouchTap on Manage and then touch SourcesTap on Edit and then AddEnter http://cydia.hackulo.us and then hit Add SourcesTap on Add Anyway when you are asked for a confirmation. Cydia will add the repo to update its sources.Tap on Return to CydiaSearch for “AppSync for iOS 5.0+” and install ths applicationTap on Install button on the top-right to install AppSync app.Cydia will download and install AppSync on your iDevice.Reboot your iPhone and then download any 1 free or paid app from store.you are doneHope this information may help you.