Sure there was, and there still is. It's called jailbreaking, but Apple doesn't like it (will refuse to support your iPhone should there be problems, so you'll

Sure there was, and there still is. It's called jailbreaking, but Apple doesn't like it (will refuse to support your iPhone should there be problems, so you'll have to revert). There were multiple apps one can still use to get jailbroken apps on one's iPhone. It also happens to be the only way one can pirate existing app store iPhone applications, sooo...