This is how I unlocked Battlefield 3 early on the PC:
1. Search Windows for "proxy"
2. Click "configure proxy server"
3. Click "LAN settings"
4. Check "use a proxy server for LAN"
5. Input this IP: 203.232.208.116
6. Input this port: 8080
7. Run the release date check by launching Battlefield 3 on Origin
8. If the release date check fails, click "retry"
9. Once it succeeds, disable the proxy
10. Enjoy playing Battlefield 3!