1.Xbox 360 <-- Currently on title update number 7 For Modern Warfare 2.
2.Play Station 3 Currently on Update 1.13 or 1.14 For Modern Warfare 2

Xbox 360 Title Update 7: Currently For the title update 7 patch for Modern Warfare 2, There are no possible way's to host any type of challenge lobbies Nor will there be in the future. Now there is a possibility to host mod menu lobbies again but they will not be like before in the previous patch of title update 6. Now to show you some proof of what I'm telling you is real information stated from a TTG Administrator, Here is what was posted and remember everything you're about to read is real information and is not false. Stated:With the latest release of the TU7 bypass for Modern Warfare 2, there are tons of users that can host 'Modded Lobbies' now. It has came to my attention that there are also numerous users who are also hosting illegitimate lobbies in hopes for rep, thanks, and subscribers for their youtube channels. Another thing for you to read on the segment of Xbox 360 title update 7 information as well stated from the same Administrator. That States: 'Challenge Lobbies' and 'Unlock All Lobbies' are not available at this time, and any user claiming to be hosting these are fake. The only type of lobbies available at this time are XP lobbies and some infections. So with that being said about Xbox 360 title update 7 we can now move on to the Play Station system.
Play Station 3: We have all seen the people on Play Station post thing's about 3.70 Custom Firmware ect. Well to tell you the truth it's all fake there are absolutely no "JAIL BREAKS/ CUSTOM FIRMWARE'S" after the update 3.55 anything else you see if a firmware spoof! Now after all that being said the only thing to be hosted on Play Station 3 is XP Lobbies but with mod menu's, From my prospective its "HOST ONLY" Mod menu's/infectable mod menu's <-- for other's. Same with Xbox but without the mod menu's For Xbox there are only XP/Infections "ABSOLUTELY NO MOD MENU'S WHAT SO EVER FOR THE XBOX!" So now with that being said for all of you fake people posting challenge lobby this and challenge lobby that this post is to shut you up because I have went out my way to make this post/thread to help other member's / you're self's. All you're doing is getting sub's / view's / bans From TTG, So what's the point of even posting the fake thing's when all you're doing is getting banned. Make no sense that someone would waist their time's to make fake thing's, Also One more thing before I end this discussion. "NO MATTER WHAT THEY SAY OR DO, DO NOT PAY THEM IN ANY WAY UNTILL STAFF FROM THE TECH GAME HAS VOUCHED! AND YOU HAVE WITNESSED TO THEM VOUCHING AS IN VISUAL PROOF POSTED ON THAT THREAD SAYING LEGIT!"