— there is no truly “portable” or “Origin-free” multiplayer experience that works on official EA servers. Any claim otherwise likely refers to cracked servers (emulators or private servers) which are not official, may be unstable, and often violate EA’s terms of service.
: Multiplayer is initiated by logging into Battlelog, selecting a server, and allowing the browser to launch the game through the EA App . Guide :: How to Play Battlefield 3 (Single + Multiplayer) — there is no truly “portable” or “Origin-free”