download link: http://fastfilehub.com/ShellyGriswold850/Modem
YouTube - USB Modem Hack !!! Strong Signal from distant location Construction...
This is a tutorial showing you how to unlock everything in the multiplayer split screen of MW2. It's pretty sick. It really is as easy as it looks.
What this hack does is:
Unlocks all guns
Makes you level 70
Gives you all camos
Gives you all Callsigns
Gives you all titles
Gives you all Emblems
Gives you an insane score
Unfortunately it doesn't give you 10th prestige, just level 70 only.