I am using Nokia 6120 classic which running on S60 platform.
Altough many people said that S60 platform is much better than S40, because of expansibility and other features (e.g. S60 supports multi-tasking). To me, some of major features that S60 is not provided, that make me so disappointed.
1. Wallpaper cannot be set as full screen wallpaper.
2. Profile does not support Timer profile.
3. During phone call, no instant shortcut for start voice recording, user has to call it by menu.
4. No Countdown timer.
5. Cannot instantly stop Music Player / FM Radio by long pressing the hang key (Red button), user has to go back to Music Player / FM Radio and then press stop.
6. Cannot directly calculate Currency exchange at Standby mode, user has to go to Converter program to do it.
In fact, all above basic features are existing in S40 platform, some of features even exists in very old model (e.g. 6230i and even black and white screen Nokia 6510).