On consoles like wii and xbox you collect them to unlock cheat codes. there are 30 of them
60
The intel items in Call of Duty: Modern Warfare 2 only unlocks trophies (PS3) or achievements (Xbox 360) when the player has collected 22 and 45 of the intel items. Unlike Call of Duty 4: Modern Warfare; collecting intel items do not unlock cheats for the single player campaign.
There is no cheat code. You unlock it by collecting all 20 Intel pieces in the single-player.
You can get the enemy Intel in campaign. Where there will be hidden and you will have to search for them.
you get unlimited ammo
Intel pieces are things that you collect during the process of the campaign, but they are hidden. if collect a certain amount they allow you to use cheats during the single player like unlimited ammo.
there isnt any cheats until u get the intel
you have to get all of the Intel and complete all of the missions on veteran
here is a link to a website that i used. i got all thirty Intel laptop thingys. http://callofduty.wikia.com/wiki/Intel
Nothing really, they just unlock achievements.
http://www.supercheats.com/guides/call-of-duty-4/Intel-locations.shtml This website will explain where all the enemy Intel units are in the Call of Duty 4 campaign.
nothing you just get achievements but infinity ward said that they will do what they did on cod 4 modern warfare 1 and make cheats for when u collect them