I think you don't need to jailbreak an iPhone because you can sideload any IPA. If you have any cracked IPA, you can use an app like Altstore or Sideloadly to sideload apps, but you need a Mac device to install apps. I'm not sure whether this works on Windows, but it does on Mac. Also, can you please tell me where I can find the cracked IPA so I can try it out?