Battlefield 3 and 4's servers are still running and are very much active. There's more optimal ways of playing these games but it's so cool to be able to still play them
Issues connecting on PS3. Anyone else? : r/battlefield3
PS3 Servers that are active *for users that cant find servers* : r/battlefield3
Battlefield 3 PS3 Server Rental Options and Prices Detailed - MP1st
UPDATE 5] Battlefield 3 1GB PS3 Patch 1.04 is Now Live, Rent A Server Option Added - MP1st
Battlefield 3: How Fan-Run Servers Are Ruining DICE's Game | Eurogamer.net