This is just to help people stop getting scammed on Modern Warfare 2 Just a few different topics
10th Prestige Lobby
With reguards to 10th prestige lobbies there are ALOT of fake lobbies, most are set out to scam people out of money. There are a few legit ones though that will do it for a price but alot of people will do it for free. If you are REALLY desperate to get a 10th lobby play safe you can ask a few questions. Such as the following.
What motherboard does your xbox have?
The answer should be either Xenon, Falcon or a Jasper if the person says they bought it pre-jtagged then you will need to ask another question, but if they say the don't know then the are FAKE
What do you use to boot the files?
XeX Loader or XeX Menu anything other than this they are FAKE

Alternativley you can ask them to level one of their friends up instantly to show that it is real, if they have someone that is 10th prestige in their lobby it doesn't mean that they are real, they could have easily gone to someone else to get leveled up.

Something to note
If the person has some of the following; high gamerscore, a number in the top part of their gamercard (it shows how long they have been on xbox live) they are most likely fake because Jtags are insta banned within a few hours so chances that they have been on xbox live or have a high gamerscore is unlikely

Gamertag Modding
This cannot be done over the internet as to mod a gamertag it would require having direct access to your HDD to place the modding gamertag on, so DO NOT fall for this, if someone has a modded gamertag simply send them a message asking how they do it and if they are nice enough they will reply telling you how to do it.

Gamerscore modding
This can be done over the internet, but can be risky loosing your account so make sure you are safe if you get it done.

Avatar Modding
I'm not sure if this can be done . . . . I beleive it can, just make sure you stay safe have a private question on your account so you can easily recover it.

Unlock all lobby
Similar to the 10th prestige lobby, you can ask the same questions for these lobbies or ask them to show certain titles etc. so you can see them to see it is legit.

Finally
Stay safe! don't get scammed, and don't fall for stupid plots to get your password etc. So just play it safe

I know this is already out there just more reminders!