How to Jailbreak iOS 6.1.3 (iPhone 4)?

I gave up on this a while ago because everyone thought iOS 7 was coming out real soon, so i figured no new jailbreaks would be released until iOS 7. Now I heard they have released some, but they all require you to pay or fill out a survey. Anyone know a free one or any method of jailbreaking my device?

Register your UDID at www.udidregistration101.webs.com and they can help you get your proper IOS 7 download links and as well help you get IOS 7 onto your iDevice. They will register you within 10 min.

I'm the developer under this account.

Just get IOS 7 right now.