People jailbreak their iOS smartphone to use Cydia. It allows users to customize their device after removing restrictions. If your iOS smartphone is running the new version of firmware, then you might be planning to jailbreak it. You must be expecting that a new tool will be released for jailbreaking iOS 6.1.3. If you are waiting for it, then you will be very sad to know that no jailbreak tool will be released for iOS 6.1.3. It means you will not be able to jailbreak this version of firmware. According to Pod2g, evad3rs dev team will not release iOS 6.1.3 jailbreak. This hacker has reported that evad3rs dev team is not working on this jailbreak.
It is confirmed that users will not be able to take the advantage of jailbreak on their device as they will not be able to jailbreak the current version of firmware. They have to wait for some more days to jailbreak their device. Currently, it is not jailbreakable as the company has patched jailbreak exploit in this version of firmware. You have to wait until the release of iOS 7 as the upcoming jailbreak tool will be released for this version of firmware. P0sixninja has recently confirmed that he will hold the jailbreak exploits for iOS 7. You should note that he has recently discovered some exploits in iOS 6.1.3. He has confirmed that the newly discovered exploits will be used to release the jailbreak tool for iOS 7.
No words from the jailbreak developer regarding the release date of this tool. If you want to take the advantage of jailbreak and use Cydia on your device, then you should not upgrade your device to the new version of iOS until the release of the next jailbreak tool. iOS 7 is expected to be released alongside the new iOS smartphone. If the report comes true, then the new jailbreak tool will be released after the release of iOS 7.