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You need to check your current profile settings on the phone.
If "warning tones" are disabled this will also cause java apps/games to be silent.
2009-08-17 13:39 - edited 2009-08-17 13:40
Thats assuming that a newer version does exist of a specific app.
Most standard and S40 based java apps do work on S60, with sound. It's generally other issues that will be encountered such as incorrect screen size.