Ingame chat
When inside a game waiting room, press 
L1, R1, L2, R2, L1, R1, L2, R2, L1, R1, L2, R2, L1, R1, L2, R2, L1, R1. 
If you entered the code correctly, you will hear a sound. From now on, chat can be 
accessed by pressing Square inside any game's waiting room. This code must be 
reactivated after you reset or turn off your PlayStation 2. Note: Press Square to 
open/leave chat for that game room. If there is a new message and you are not in 
the chat, you just press Square again. To summarize, press Square after the code 
is enabled to make a keyboard appear where you can chat. Press Triangle to exit 
the chat, and Square to re-enter. Incoming messages will appear in the bottom 
right of the screen.