Two Players on One PS3 Playing CoD4 Online (Not Splitscreen)?

CoD4 Online on One PS3

Impossible. Call of Duty 4 online multiplayer requires individual accounts on separate consoles.

• Splitscreen – Local only (2 players, 1 console, offline/private matches).
• Online – Each player needs own PS3 + PSN account.

Workarounds

• Two PS3s + two accounts = both play online separately.
• Two accounts on one PS3 = take turns playing online.

Note: CoD4 servers no longer officially supported—unofficial servers may exist but with limited population.