I found some example. QContactDetailDefinition should be saved into QContactManager.
Note: My QContactManager is created : QContactManager* cm = new QContactManager("symbian");
customField.setDataType( QVariant::String );
ISSUE: I'm getting error ( manager->saveDetailDefinition(customDef) )
QContactManager::NotSupportedError - 9 ( The most recent operation failed because the requested operation is not supported in the specified store )
Anyone know if is even possible to add custom fields on Symbian^3
My device is C7 - Anna