We are now hearing more advancements on the untethered jailbreak for iOS 5.1. iOS hacker pod2g yesterday announced that his has two vulnerabilities for iOS 5.1 jailbreak. Today the hacker tweeted that his “iPhone 4 running iOS 5.1 is now untethered.” That’s good news for iPhone 4 owners. However, pod2g, did not mention anything about the untethered jailbreak for iPhone 4S and newer devices like the iPad 3. No ETA for the jailbreak was given.