iOS 7 hasn’t been jailbroken yet, however there’s a movement to encourage a working Jailbreak.
It takes severe amounts of time to exploit an OS and develop a deployable hack. Those who do are currently good samaritans who receive little in return for their works. isios7jailbrokenyet.com has an answer: a crowd funded bounty for a hack, complete with an impressive array of judges, including iFixit.com’s co-founder Kyle Wiens.
I dropped $5 to the cause. Its easily worth more than that for a working jailbreak. Go to: https://isios7jailbrokenyet.com