First, You have to download and install a "gameboy advance emulator" on your symbian phone.
Download and install the application to your memory card, and it will automatically create a folder on your memory card. The name of the folder is "vampent". Just search for it and locate it.
Inside the "vampent" folder, there is also another folder named "gbaroms".
The "gbarom" folder will contain all the gameboy advance games. Even if you download any gameboy advance game, you will have to move it to the "gbaroms" folder before you can play them on your phone.
HOW TO DOWNLOAD GAMEBOY ADVANCE GAMES TO PLAY ON YOUR SYMBIAN PHONE
Click here to download gameboy advance games for your symbian phone.

After downloading, extract the .gba file, and move it to the "gbaroms" folder inside the "vampent" folder on your memory card.

Now, you can either go to the "gbaroms" folder to play the game or open the app and play the game.