Question details: I know that it does not support mp3 so what format do iIneed to have for 6600 ringtones?

Answer:

The Nokia 6600 uses the Nokia Series 60 platform which is powered by Symbian OS v7.0 and is a tri-band mobile phone, digital camera and PDA.

The mp3 format is not supported by the Nokia 6600 as standard. Iif you try to play an mp3 file you willget an 'Unknown file format' message. There are some applications that can let you use your 6600 as an MP3 player.The best is UltraMP3.

With Oxygen II package for your PC includes ringtone management and can convert audio files like mp3 files,etc into the truetone format used by Nokia 6600.