Things You'll Need
Instructions
First, in order to unlock prestige mode in Modern Warfare 2, you will need to have an online account for whatever platform you play it on.
Whether it is Xbox Live, Playstation Network, or just an internet enabled computer, prestige mode is only unlocked through multiplayer.
Next, to activate prestige mode you need to level up to level 70 in multiplayer. You do this via earning experience points when playing matches.
While points are awarded simply for finishing a game, you can earn points more quickly by getting more kills and winning or placing in the match. There is a large amount of material on the internet regarding how to level up quickly.
Last, you must make the decision to enable prestige mode once you reach level 70. Level 70 is the highest rank that you can achieve.
If you enable prestige mode, you will lose all of your weapons and perks and essentially work your way back up through the levels. The advantage to prestige mode is it demonstrates to other players how far you have come as you earn prestige icons/emblems.
If you are sure you want to enter prestige mode, select yes to both prompts that appear (the second one reminds you there is no turning back).
After accepting, you are now in prestige mode and can work your way back up to level 70.