Is there an untethered jailbreak for ios 7 and if not, when will one be available?

I have a straighttalk iphone 5 running ios 7, is there a jailbreak or any other way I can change my carrier name on my iPhone?

The best place to check for a jailbreak is http://www.isthereajailbreak.com/

It collects all the real jailbreaks from all the jailbreakers and puts them in one place.

Safe, easy and as it always should be, FREE!

Http://www.youtube.com/user/iOS7JB