I have made application in j2me using lwuit and successfully built on S60 3d edition FP2, now to make wide compatibility i want to make build for Symbian^3, so is it possible?
Yeah its possible. Because LWUIT supports both touch and non touch mobiles and no need to change the code for this. AFAIK you have to check following steps,
Just test the LWUITDemo application from repository on symbian s60 3rd editon and symbian^3 mobiles. Then you can find the what are all the changes have to do. Also look on this wiki information about Symbian.